diff --git a/Layout/default/AddressDB/Form.php b/Layout/default/AddressDB/Form.php
index 968632650..6c90cae7c 100644
--- a/Layout/default/AddressDB/Form.php
+++ b/Layout/default/AddressDB/Form.php
@@ -144,7 +144,18 @@
                       <?php endif; ?>
                     </div>
                   </div>
-                  
+
+                    <div class="form-group row">
+                        <label class="col-lg-2 col-form-label" for="hausnummer">Stiege</label>
+                        <div class="col-lg-10">
+                            <?php if(is_array($save_data) && array_key_exists("stiege", $save_data)): ?>
+                                <input type="text" class="form-control" name="stiege" id="stiege" value="<?=$save_data['stiege']?>">
+                            <?php else: ?>
+                                <input type="text" class="form-control" name="stiege" id="stiege" value="<?=$address->stiege?>">
+                            <?php endif; ?>
+                        </div>
+                    </div>
+
                   <div class="form-group row">
                     <label class="col-lg-2 col-form-label" for="plz">PLZ *</label>
                     <div class="col-lg-10">
diff --git a/Layout/default/AddressDB/Index.php b/Layout/default/AddressDB/Index.php
index 51bc19991..57f4db95c 100644
--- a/Layout/default/AddressDB/Index.php
+++ b/Layout/default/AddressDB/Index.php
@@ -167,6 +167,7 @@
                 <th>Ortschaft</th>
                 <th>Straße</th>
                 <th>Hausnummer</th>
+                <th>Stiege</th>
                 <th>Wohneinheiten</th>
                 <th>GDA-Eigenschaft</th>
                 <th>Rollout Jahr</th>
@@ -184,6 +185,7 @@
                 <td><?=$address->ortschaft->name?></td>
                 <td><?=$address->strasse->name?></td>
                 <td><?=$address->hausnummer?></td>
+                <td><?=$address->stiege?></td>
                 <td><?=count($address->wohneinheiten)?></td>
                 <td><?=$address->gdaeigenschaft?></td>
                 <td><?=$address->rollout?></td>
diff --git a/Layout/default/Preorder/Index.php b/Layout/default/Preorder/Index.php
index 3dc2a50fd..82a192e69 100644
--- a/Layout/default/Preorder/Index.php
+++ b/Layout/default/Preorder/Index.php
@@ -277,7 +277,7 @@
                 <?php elseif($preorder->adb_hausnummer_id): ?>
                 <td <?=($preorder->address_created) ? "class='alert-warning' title='Adresse manuell angelegt'" : ""?>">
                   <?=$preorder->adb_hausnummer->strasse->name?>
-                  <?=$preorder->adb_hausnummer->hausnummer?><br />
+                  <?=$preorder->adb_hausnummer->hausnummer?><?=($preorder->adb_hausnummer->stiege) ? "/".$preorder->adb_hausnummer->stiege : ""?><br />
                   <?=($preorder->adb_wohneinheit_id) ? ((string)$preorder->adb_wohneinheit ? $preorder->adb_wohneinheit."<br />" : "") : "<i class='text-pink'>&lt;keine Wohneinheit&gt;</i><br />"?>
                   <?=$preorder->adb_hausnummer->plz->plz?>
                   <?=$preorder->adb_hausnummer->ortschaft->name?><br />
diff --git a/application/ADBHausnummer/ADBHausnummer.php b/application/ADBHausnummer/ADBHausnummer.php
index 097e7a2a8..976c8d3c6 100644
--- a/application/ADBHausnummer/ADBHausnummer.php
+++ b/application/ADBHausnummer/ADBHausnummer.php
@@ -49,6 +49,9 @@ class ADBHausnummer extends mfBaseModel {
     $address .= " ".$this->getProperty("ortschaft")->name.",";
     $address .= " ".$this->getProperty("strasse")->name;
     $address .= " ".$this->hausnummer;
+    if($this->stiege) {
+        $address .= "/".$this->stiege;
+    }
     return $address;
   }
   
diff --git a/application/ADBHausnummer/ADBHausnummerModel.php b/application/ADBHausnummer/ADBHausnummerModel.php
index faae998ef..542abd744 100644
--- a/application/ADBHausnummer/ADBHausnummerModel.php
+++ b/application/ADBHausnummer/ADBHausnummerModel.php
@@ -10,6 +10,7 @@ class ADBHausnummerModel {
   public $plz_id;
   public $strasse_id;
   public $hausnummer;
+  public $stiege;
   public $zusatz;
   public $grund_nr;
   public $gdaeigenschaft;
@@ -338,6 +339,13 @@ class ADBHausnummerModel {
         $where .= " AND Hausnummer.`hausnummer` like '$hausnummer%'";
       }
     }
+
+      if(array_key_exists("stiege", $filter)) {
+          $stiege = FronkDB::singleton()->escape($filter['stiege']);
+          if($stiege) {
+              $where .= " AND stiege.name = '$stiege'";
+          }
+      }
     
     if(array_key_exists("strasse", $filter)) {
       $strasse = FronkDB::singleton()->escape($filter['strasse']);
diff --git a/application/AddressDB/AddressDB.php b/application/AddressDB/AddressDB.php
index 89a105911..a102b4928 100644
--- a/application/AddressDB/AddressDB.php
+++ b/application/AddressDB/AddressDB.php
@@ -26,6 +26,7 @@ class AddressDB {
     `Hausnummer`.`subcd` AS `subcd`,
     `Hausnummer`.`oaid` AS `hausnummer_oaid`,
     `Hausnummer`.`hausnummer` AS `hausnummer`,
+    `Hausnummer`.`stiege` AS `hausnummer_stiege`,
     `Hausnummer`.`extref` AS `hausnummer_extref`,
     `Hausnummer`.`unit_count` AS `unit_count`,
     `Hausnummer`.`meridian` AS `meridian`,
@@ -95,7 +96,7 @@ class AddressDB {
     if($netzgebiet_id) {
       $res = $this->db->query("SELECT rimo_fcp_name FROM `Hausnummer` WHERE netzgebiet_id=$netzgebiet_id GROUP BY rimo_fcp_name ORDER BY LENGTH(rimo_fcp_name), rimo_fcp_name");
     } else {
-      $res = $this->db->query("SELECT rimo_fcp_name FROM `Hausnummer` WHERE GROUP BY rimo_fcp_name ORDER BY rimo_fcp_name");
+      $res = $this->db->query("SELECT rimo_fcp_name FROM `Hausnummer` GROUP BY rimo_fcp_name ORDER BY LENGTH(rimo_fcp_name), rimo_fcp_name");
     }
     if($this->db->num_rows($res)) {
       while($data = $this->db->fetch_object($res)) {
@@ -257,6 +258,7 @@ class AddressDB {
     $hausnummer_data['plz_id'] = $plz->id;
     $hausnummer_data['strasse_id'] = $strasse->id;
     $hausnummer_data['hausnummer'] = $data['hausnummer'];
+    $hausnummer_data['stiege'] = $data['stiege'];
     $hausnummer_data['grund_nr'] = $data['grund_nr'];
     $hausnummer_data['gdaeigenschaft'] = $data['gdaeigenschaft'];
     $hausnummer_data['meridian'] = $data['meridian'];
diff --git a/application/AddressDB/AddressDBController.php b/application/AddressDB/AddressDBController.php
index 8a015bf8b..518016063 100644
--- a/application/AddressDB/AddressDBController.php
+++ b/application/AddressDB/AddressDBController.php
@@ -270,7 +270,7 @@ class AddressDBController extends mfBaseController {
     if(!$this->me->is("Admin")) {
       $required[] = "netzgebiet_id";
     }
-    foreach(['adrcd','extref','rimo_id','netzgebiet_id','strasse','hausnummer','plz','ortschaft','gemeinde','grund_nr','gdaeigenschaft','meridian','rw','hw','gps_lat','gps_long','unit_count','visibility'] as $field) {
+    foreach(['adrcd','extref','rimo_id','netzgebiet_id','strasse','hausnummer','stiege','plz','ortschaft','gemeinde','grund_nr','gdaeigenschaft','meridian','rw','hw','gps_lat','gps_long','unit_count','visibility'] as $field) {
       if(in_array($field, $required)) {
         if(!trim($r->$field)) {
           $this->layout()->setFlash("'".ucfirst($field)."' darf nicht leer sein!", "error");
diff --git a/application/Admin/functions/IvtContractImport.php b/application/Admin/functions/IvtContractImport.php
index 891d38434..4c84faba2 100644
--- a/application/Admin/functions/IvtContractImport.php
+++ b/application/Admin/functions/IvtContractImport.php
@@ -310,6 +310,8 @@ class Admin_IvtContractImport {
 
                 }
             }
+
+            $this->addVoipData($ivt_customer, $customer);
         }
 
         return $data;
@@ -443,7 +445,6 @@ class Admin_IvtContractImport {
         // lookup radius data
         $ruser = $this->getRadiusUser($ivt_customer, $ivt_product, $contract);
         // lookup voip data
-        //$voip_data = $this->getVoipData($ivt_customer, $ivt_product, $contract);
 
         foreach($contract->configgroups as $cgroup) {
 
@@ -544,6 +545,7 @@ class Admin_IvtContractImport {
          * Webhosting
          *
          */
+        return true;
     }
 
 
@@ -619,26 +621,33 @@ class Admin_IvtContractImport {
         // return data
     }
 
-    private function getVoipData($ivt_customer, $ivt_product, $contract) {
-        // find voice number in ivt
-        $ivtnum = IvtCustomerTelephoneNrModel::getFirst(["cid" => $ivt_customer->id]);
-        if(!$ivtnum) return true;
+    private function addVoipData($ivt_customer, $customer) {
+        $ported_in = [];
+        $voicenumbers = [];
+        // find voice numbers in ivt
+        foreach(IvtCustomerTelephoneNrModel::search(["cid" => $ivt_customer->id]) as $ivtnum) {
+            $number = preg_replace('/^0043/', '43', $ivtnum->number);
+            if(!$number) return true;
 
-        $number = preg_replace('/^0043/', '43', $ivtnum->number);
-        if(!$number) return true;
+            // find number in block
+            $voicenumberblock = Voicenumberblock::findBlock($number);
+            if(!$voicenumberblock) {
+                $ported_in[] = $number;
+            }
 
-        // find number in block
-        $voicenumberblock = Voicenumberblock::findBlock($number);
-        if(!$voicenumberblock) return false;
+            if(!$voicenumberblock->isNumberInBlock($number)) {
+                die("Block für Nummer $number enthält nummer nicht.");
+            }
 
-        if(!$voicenumberblock->isNumberInBlock($number)) {
-            die("Block für Nummer $number enthält nummer nicht.");
+            $voicenumber = $voicenumberblock->getVoicenumber($number);
+            if(!$voicenumber) {
+                die("Nummer $number gehört nicht in Block ".$voicenumberblock->id);
+            }
+            $voicenumbers[] = $voicenumber;
         }
 
-        $voicenumber = $voicenumberblock->getVoicenumber($number);
-        if(!$voicenumber) {
-            die("Nummer $number gehört nicht in Block ".$voicenumberblock->id);
-        }
+
+
 
         // return voicenumber object
         return $voicenumber;
diff --git a/application/Api/v1/AddressdbApicontroller.php b/application/Api/v1/AddressdbApicontroller.php
index 912301570..a1f03682a 100644
--- a/application/Api/v1/AddressdbApicontroller.php
+++ b/application/Api/v1/AddressdbApicontroller.php
@@ -451,6 +451,7 @@ class AddressdbApicontroller extends mfBaseApicontroller {
               'district' => $data->ortschaft,
               'street' => $data->strasse,
               'housenumber' => $housenumber,
+              'stiege' => $data->hausnummer_stiege,
               'lot_number' => $data->grund_nr,
               'meridian' => $data->meridian,
               'rw' => $data->rw,
@@ -475,7 +476,6 @@ class AddressdbApicontroller extends mfBaseApicontroller {
             'oaid' => $data->wohneinheit_oaid,
             'num' => (int)$data->num,
             'block' => $data->block,
-            'stiege' => $data->stiege,
             'stock' => $data->stock,
             'tuer' => $data->tuer,
             'zusatz' => $data->zusatz,
@@ -593,6 +593,7 @@ class AddressdbApicontroller extends mfBaseApicontroller {
                 $new_address['cluster_id'] = $ta['cluster_id'];
                 $new_address['street'] = $ta['street'];
                 $new_address['housenumber'] = $ta['housenumber'];
+                $new_address['stiege'] = $ta['stiege'];
                 $new_address['zip'] = $ta['zip'];
                 $new_address['city'] = $ta['city'];
                 if(array_key_exists("municipality", $ta)) {
@@ -606,7 +607,6 @@ class AddressdbApicontroller extends mfBaseApicontroller {
                 $new_address['building_unit_count'] = $ta['building_unit_count'];
                 $new_address['num'] = $u['num'];
                 $new_address['block'] = $u['block'];
-                $new_address['stiege'] = $u['stiege'];
                 $new_address['stock'] = $u['stock'];
                 $new_address['tuer'] = $u['tuer'];
                 $new_address['zusatz'] = $u['zusatz'];
@@ -637,6 +637,7 @@ class AddressdbApicontroller extends mfBaseApicontroller {
     $search_district = $this->db()->escape(trim($get['district']));
     $search_city = $this->db()->escape(trim($get['city']));
     $search_housenumber = $this->db()->escape(trim($get['housenumber']));
+    $search_stiege = $this->db()->escape(trim($get['stiege']));
     
     $format = "flat";
     if($get['format'] == "tree") {
@@ -670,7 +671,10 @@ class AddressdbApicontroller extends mfBaseApicontroller {
     if($search_housenumber && $search_housenumber != "%") {
       $where .= " AND Hausnummer.hausnummer like '$search_housenumber%'";
     }
-    
+    if($search_stiege && $search_stiege != "%") {
+      $where .= " AND Hausnummer.stiege like '$search_stiege%'";
+    }
+
     if(count($this->filter_salescluster_ids)) {
       $where .= " AND Hausnummer.netzgebiet_id IN (".implode(",", $this->filter_salescluster_ids).")";
     }
@@ -682,7 +686,7 @@ class AddressdbApicontroller extends mfBaseApicontroller {
     //var_dump($this->filter_salescluster_ids);exit;
     
     $sql = AddressDB::$wohneinheit_query;
-    $sql .= "\n WHERE $where ORDER BY plz, gemeinde, ortschaft, strasse, LENGTH(hausnummer), hausnummer, `Wohneinheit`.block, `Wohneinheit`.stiege, `Wohneinheit`.stock, LENGTH(num), num, LENGTH(`Wohneinheit`.tuer), `Wohneinheit`.tuer";
+    $sql .= "\n WHERE $where ORDER BY plz, gemeinde, ortschaft, strasse, LENGTH(hausnummer), hausnummer, LENGTH(hausnummer_stiege), hausnummer_stiege, `Wohneinheit`.block, `Wohneinheit`.stock, LENGTH(num), num, LENGTH(`Wohneinheit`.tuer), `Wohneinheit`.tuer";
     
     //$sql = "SELECT * FROM view_wohneinheit WHERE $where ORDER BY plz, gemeinde, ortschaft, strasse, LENGTH(hausnummer), hausnummer, block, stiege, stock, LENGTH(num), num, LENGTH(tuer), tuer";
     $this->log->debug($sql);
@@ -736,6 +740,7 @@ class AddressdbApicontroller extends mfBaseApicontroller {
               'district' => $data->ortschaft,
               'street' => $data->strasse,
               'housenumber' => $housenumber,
+              'stiege' => $data->hausnummer_stiege,
               'lot_number' => $data->grund_nr,
               'meridian' => $data->meridian,
               'rw' => $data->rw,
@@ -761,7 +766,6 @@ class AddressdbApicontroller extends mfBaseApicontroller {
             'oaid' => $data->wohneinheit_oaid,
             'num' => (int)$data->num,
             'block' => $data->block,
-            'stiege' => $data->stiege,
             'stock' => $data->stock,
             'tuer' => $data->tuer,
             'zusatz' => $data->zusatz,
@@ -801,6 +805,7 @@ class AddressdbApicontroller extends mfBaseApicontroller {
               $new_address['cluster_id'] = $ta['cluster_id'];
               $new_address['street'] = $ta['street'];
               $new_address['housenumber'] = $ta['housenumber'];
+              $new_address['stiege'] = $ta['stiege'];
               $new_address['zip'] = $ta['zip'];
               $new_address['city'] = $ta['city'];
               if(array_key_exists("municipality", $ta)) {
@@ -814,7 +819,6 @@ class AddressdbApicontroller extends mfBaseApicontroller {
               $new_address['building_unit_count'] = $ta['building_unit_count'];
               $new_address['num'] = $u['num'];
               $new_address['block'] = $u['block'];
-              $new_address['stiege'] = $u['stiege'];
               $new_address['stock'] = $u['stock'];
               $new_address['tuer'] = $u['tuer'];
               $new_address['zusatz'] = $u['zusatz'];
diff --git a/application/Api/v1/PreorderApicontroller.php b/application/Api/v1/PreorderApicontroller.php
index 94c8c5041..31ae7cca4 100644
--- a/application/Api/v1/PreorderApicontroller.php
+++ b/application/Api/v1/PreorderApicontroller.php
@@ -374,6 +374,7 @@ class PreorderApicontroller extends mfBaseApicontroller {
     $address_search_fields = [
       'street' => 'strasse',
       'housenumber' => "hausnummer",
+      'stiege' => "hausnummer_stiege",
       'zip' => "plz"
     ];
     if($this->district_is_city) {
@@ -398,7 +399,7 @@ class PreorderApicontroller extends mfBaseApicontroller {
     }
     
     $unit_search = [];
-    foreach(['block','stiege','stock','tuer','unit_string'] as $key) {
+    foreach(['block','stock','tuer','unit_string'] as $key) {
       if(property_exists($this->post['address'], $key) && trim($this->post['address']->$key)) {
         $unit_search[$key] = trim($this->post['address']->$key);
       }
@@ -406,7 +407,7 @@ class PreorderApicontroller extends mfBaseApicontroller {
     
     
     // ignore unit_string if the specific fields were provided
-    if($unit_search['block'] || $unit_search['stiege'] || $unit_search['stock'] || $unit_search['tuer']) {
+    if($unit_search['block'] || $unit_search['stock'] || $unit_search['tuer']) {
       unset($unit_search['unit_string']);
     }
     
@@ -569,7 +570,7 @@ class PreorderApicontroller extends mfBaseApicontroller {
 
       // if all unit values are empty try to find the unit with all empty values
       // failure is not an error, but must be checked by a human at some point
-      $where = "hausnummer_id=".$address->hausnummer_id." AND (block = '' OR block IS NULL) AND (stiege = '' OR stiege IS NULL) AND (stock = '' OR stock IS NULL) AND (tuer = '' OR tuer IS NULL) AND (bezeichner = '' OR bezeichner IS NULL)";
+      $where = "hausnummer_id=".$address->hausnummer_id." AND (block = '' OR block IS NULL) AND (stock = '' OR stock IS NULL) AND (tuer = '' OR tuer IS NULL) AND (bezeichner = '' OR bezeichner IS NULL)";
       if($zusatz) {
         $where .= " AND zusatz='$zusatz'";
       } else {
diff --git a/application/Preorder/Preorder.php b/application/Preorder/Preorder.php
index 46fba4d77..989950242 100644
--- a/application/Preorder/Preorder.php
+++ b/application/Preorder/Preorder.php
@@ -530,13 +530,14 @@ class Preorder extends mfBaseModel {
     $address['cluster_id'] = $hausnummer->netzgebiet->extref;
     $address['street'] = $hausnummer->strasse->name;
     $address['housenumber'] = $hausnummer->hausnummer;
+    $address['stiege'] = $hausnummer->stiege;
     $address['zip'] = $hausnummer->plz->plz;
     $address['city'] = $hausnummer->strasse->gemeinde->name;
     $address['municipality'] = "";
     $address['district'] = $hausnummer->ortschaft->name;
     $address['block'] = ($wohneinheit->block) ? $wohneinheit->block : null;
     $address['stock'] = ($wohneinheit->stock) ? $wohneinheit->stock : null;
-    $address['stiege'] = ($wohneinheit->stiege) ? $wohneinheit->stiege : null;
+    //$address['stiege'] = ($wohneinheit->stiege) ? $wohneinheit->stiege : null;
     $address['tuer'] = ($wohneinheit->tuer) ? $wohneinheit->tuer : null;
     $address['unit_string'] = ($wohneinheit->bezeichner) ? $wohneinheit->bezeichner : null;
     $address['is_shipping'] = ($this->shipping_address == "address") ? true : false;
@@ -554,12 +555,12 @@ class Preorder extends mfBaseModel {
     $customer['firstnam'] = ($this->firstname) ? $this->firstname : null;
     $customer['lastname'] = ($this->lastname) ? $this->lastname : null;
     $customer['street'] = ($this->street) ? $this->street : null;
+    $customer['stiege'] = ($this->stiege) ? $this->stiege : null;
     $customer['housenumber'] = ($this->housenumber) ? $this->housenumber : null;
     $customer['zip'] = ($this->zip) ? $this->zip : null;
     $customer['city'] = ($this->city) ? $this->city : null;
     $customer['block'] = ($this->block) ? $this->block : null;
     $customer['stock'] = ($this->stock) ? $this->stock : null;
-    $customer['stiege'] = ($this->stiege) ? $this->stiege : null;
     $customer['tuer'] = ($this->tuer) ? $this->tuer : null;
     $customer['unit_string'] = ($this->unit_string) ? $this->unit_string : null;
     $customer['phone'] = ($this->phone) ? $this->phone : null;
diff --git a/application/Preorder/PreorderModel.php b/application/Preorder/PreorderModel.php
index 38ec1607c..2441c8d0b 100644
--- a/application/Preorder/PreorderModel.php
+++ b/application/Preorder/PreorderModel.php
@@ -730,6 +730,13 @@ class PreorderModel {
         $where .= " AND adb_hausnummer.hausnummer like '%$hausnummer%'";
       }
     }
+
+      if(array_key_exists("stiege", $filter)) {
+          $stiege = FronkDB::singleton()->escape($filter['stiege']);
+          if($stiege) {
+              $where .= " AND adb_hausnummer.stiege like '%$stiege%'";
+          }
+      }
     
     if(array_key_exists("unit_count", $filter)) {
       $unit_count = $filter['unit_count'];
diff --git a/db/migrations/20240516114029_adb_hausnummer_add_stiege.php b/db/migrations/20240516114029_adb_hausnummer_add_stiege.php
new file mode 100644
index 000000000..0a8e9edec
--- /dev/null
+++ b/db/migrations/20240516114029_adb_hausnummer_add_stiege.php
@@ -0,0 +1,31 @@
+<?php
+declare(strict_types=1);
+
+use Phinx\Migration\AbstractMigration;
+
+final class AdbHausnummerAddStiege extends AbstractMigration
+{
+    public function up(): void
+    {
+        if($this->getEnvironment() == "thetool") {
+          
+        }
+        
+        if($this->getEnvironment() == "addressdb") {
+            $table = $this->table("Hausnummer");
+            $table->addColumn("stiege", "string", ["null" => true, "default" => null, "after" => "hausnummer"]);
+            $table->update();
+        }
+    }
+
+    public function down(): void
+    {
+        if($this->getEnvironment() == "thetool") {
+          
+        }
+        
+        if($this->getEnvironment() == "addressdb") {
+            $this->table("Hausnummer")->removeColumn("stiege")->save();
+        }
+    }
+}
diff --git a/public/docs/preorder-api.yaml b/public/docs/preorder-api.yaml
index 5df8b0e6a..12ce71e4f 100644
--- a/public/docs/preorder-api.yaml
+++ b/public/docs/preorder-api.yaml
@@ -5,7 +5,7 @@ info:
   license:
     name: Apache 2.0 License
     url: http://www.apache.org/licenses/LICENSE-2.0.html
-  version: 1.0.0
+  version: 1.2.0
 servers:
   - url: https://thetool-test.xinon.at/api/v1
   - url: https://thetool.xinon.at/api/v1
@@ -176,6 +176,11 @@ paths:
           in: query
           schema:
             type: string
+        - name: stiege
+          description: Stiege Suchbegriff
+          in: query
+          schema:
+            type: string
       responses:
         '200':
           description: |
@@ -435,7 +440,7 @@ paths:
         
         Soll Starterkit an Anschlussadresse gesendet werden, muss `address.is_shipping` auf true gestellt werden, bei false wird das Starterkit an Vertragsinhaber (`customer`) gesendet. 
         
-        Wohneinheitsidentifikation (Block, Stiege, Stock, Tür) kann strukturiert mit jeweils einem eigenen Feld übergeben werden oder alle Wohneinheitsdaten in einem einzigen String (`unit_string`).
+        Wohneinheitsidentifikation (Block, Stock, Tür) kann strukturiert mit jeweils einem eigenen Feld übergeben werden oder alle Wohneinheitsdaten in einem einzigen String (`unit_string`).
         
         ---
         
@@ -920,6 +925,10 @@ components:
           type: string
           description: Hausnummer
           example: 13
+        stiege:
+          type: string
+          description: Stiege
+          example: 2
         zip:
           type: string
           description: PLZ
@@ -1007,10 +1016,6 @@ components:
                 type: string
                 description: Stock
                 example: 42
-              stiege:
-                type: string
-                description: Stiege
-                example: ""
               tuer:
                 type: string
                 description: Tür
@@ -1040,6 +1045,10 @@ components:
           type: string
           description: Hausnummer
           example: 13
+        stiege:
+          type: string
+          description: Stiege
+          example: 2
         zip:
           type: string
           description: PLZ
@@ -1088,10 +1097,6 @@ components:
           type: string
           description: Stock
           example: 42
-        stiege:
-          type: string
-          description: Stiege
-          example: ""
         tuer:
           type: string
           description: Tür
@@ -1144,6 +1149,9 @@ components:
         housenumber:
           type: string
           description: Hausnummer der Anschlussadresse
+        stiege:
+          type: string
+          description: Stiege der Anschlussadresse
         zip:
           type: string
           description: PLZ der Anschlussadresse
@@ -1159,9 +1167,6 @@ components:
         stock:
           type: string
           description: Stock der Anschlussadresse
-        stiege:
-          type: string
-          description: Stiege der Anschlussadresse
         tuer:
           type: string
           description: Tür der Anschlussadresse
@@ -1307,6 +1312,10 @@ components:
               type: string
               description: Hausnummer der Anschlussadresse
               example: 13
+            stiege:
+              type: string
+              description: Stiege der Anschlussadresse
+              example: "2"
             zip:
               type: string
               description: PLZ der Anschlussadresse
@@ -1323,10 +1332,6 @@ components:
               type: string
               description: Stock der Anschlussadresse
               example: 42
-            stiege:
-              type: string
-              description: Stiege der Anschlussadresse
-              example: ""
             tuer:
               type: string
               description: Tür der Anschlussadresse
@@ -1689,6 +1694,10 @@ components:
           type: string
           description: Hausnummer Kunde
           example: 42
+        stiege:
+          type: string
+          description: Stiege
+          example: 2
         zip:
           type: string
           description: PLZ Kunde
@@ -1709,10 +1718,6 @@ components:
           type: string
           description: Adresszusatz
           example: null
-        stiege:
-          type: string
-          description: Adresszusatz
-          example: null
         stock:
           type: string
           description: Adresszusatz