diff --git a/Layout/default/Preordercampaign/Admin.php b/Layout/default/Preordercampaign/Admin.php
index 99c547f3a..009c88ce2 100644
--- a/Layout/default/Preordercampaign/Admin.php
+++ b/Layout/default/Preordercampaign/Admin.php
@@ -96,7 +96,27 @@
         </div>
         
         
-        
+        <div class="card">
+          <div class="card-body">
+            <h4>OAIDs auf Wohneinheiten updated</h4>
+            <div class="row justify-content-end">
+              <div class="col-10">
+                <div class="row">
+                  <div class="col">
+                    Speichert OAID in Wohneinheit falls fehlt oder inkorrekt:
+                  </div>
+                </div>
+                <div class="row mt-1">
+                  <div class="col">
+                    <a href="<?=self::getUrl("Preordercampaign","updateUnitOAIDs", ["id" => $campaign->id])?>" class="btn btn-primary"><i class="far fa-r"></i> <i class="far fa-gears"></i> Wohneinheiten OAID Update</a><br />
+                  </div>
+                </div>
+              </div>
+              
+              
+            </div>
+          </div>
+        </div>
         
         
         
diff --git a/application/Preordercampaign/PreordercampaignController.php b/application/Preordercampaign/PreordercampaignController.php
index d9ffe1a42..1d6dbe9be 100644
--- a/application/Preordercampaign/PreordercampaignController.php
+++ b/application/Preordercampaign/PreordercampaignController.php
@@ -459,6 +459,38 @@ class PreordercampaignController extends mfBaseController {
     $this->layout()->set("campaign", $campaign);
   }
   
+  protected function updateUnitOAIDs() {
+    $this->layout()->setTemplate("Preordercampaign/Admin");
+    
+    $id = $this->request->id;
+    if(!is_numeric($id) || !$id) {
+      $this->layout()->setFlash("Vorbestellkampagne nicht gefunden", "error");
+      $this->redirect("Preordercampaign");
+    }
+    
+    $campaign = new Preordercampaign($id);
+    if(!$campaign->id) {
+      $this->layout()->setFlash("Vorbestellkampagne nicht gefunden", "error");
+      $this->redirect("Preordercampaign");
+    }
+    
+    $updated_units = 0;
+    
+    foreach(PreorderModel::search(["preordercampaign_id" => $id, 'deleted' => 0]) as $preorder) {
+      if(!$preorder->adb_wohneinheit_id) continue;
+      if(!$preorder->oaid) continue;
+      $unit = $preorder->adb_wohneinheit;
+      
+      if(!$preorder->oaid || $unit->oaid != $preorder->oaid) {
+        $preorder->save();
+        $updated_units++;
+      }
+    }
+    
+    $this->layout()->setFlash("$updated_units Wohneinheiten aktualisiert", "success");
+    $this->redirect("Preordercampaign", "Admin", ["id" => $id]);
+    
+  }
   
   protected function assignOpenAccessIdsToPreorders() {
     $this->layout()->setTemplate("Preordercampaign/Admin");