diff --git a/src/lib/submissionItemsService.ts b/src/lib/submissionItemsService.ts
index 5dab22c3..6bfa9398 100644
--- a/src/lib/submissionItemsService.ts
+++ b/src/lib/submissionItemsService.ts
@@ -224,22 +224,109 @@ export async function detectDependencyConflicts(
 }
 
 /**
- * Update individual submission item status
- * Note: item_data and original_data are read-only (managed via relational tables)
+ * Update individual submission item status and data
  */
 export async function updateSubmissionItem(
   itemId: string,
   updates: Partial<SubmissionItemWithDeps>
 ): Promise<void> {
-  // Remove item_data and original_data from updates (managed via relational tables)
   const { item_data, original_data, ...cleanUpdates } = updates;
   
+  // Update submission_items table
   const { error } = await supabase
     .from('submission_items')
     .update(cleanUpdates)
     .eq('id', itemId);
 
   if (error) throw error;
+
+  // If item_data is provided, update the relational table
+  if (item_data !== undefined) {
+    // Fetch the item to get its type and foreign keys
+    const { data: item, error: fetchError } = await supabase
+      .from('submission_items')
+      .select('item_type, park_submission_id, ride_submission_id, company_submission_id, ride_model_submission_id, timeline_event_submission_id, photo_submission_id')
+      .eq('id', itemId)
+      .single();
+
+    if (fetchError) throw fetchError;
+    if (!item) throw new Error(`Submission item ${itemId} not found`);
+
+    // Update the appropriate relational table
+    switch (item.item_type) {
+      case 'park': {
+        if (!item.park_submission_id) break;
+        const parkData = item_data as any;
+        const updateData: any = {
+          ...parkData,
+          // Transform location → temp_location_data for storage
+          temp_location_data: parkData.location || null,
+          updated_at: new Date().toISOString()
+        };
+        
+        // Remove fields that shouldn't be in park_submissions
+        delete updateData.location;
+        
+        // Remove undefined fields
+        Object.keys(updateData).forEach(key => {
+          if (updateData[key] === undefined) delete updateData[key];
+        });
+
+        const { error: updateError } = await supabase
+          .from('park_submissions')
+          .update(updateData)
+          .eq('id', item.park_submission_id);
+
+        if (updateError) throw updateError;
+        break;
+      }
+      case 'ride': {
+        if (!item.ride_submission_id) break;
+        const { error: updateError } = await supabase
+          .from('ride_submissions')
+          .update({ ...(item_data as any), updated_at: new Date().toISOString() })
+          .eq('id', item.ride_submission_id);
+
+        if (updateError) throw updateError;
+        break;
+      }
+      case 'operator':
+      case 'manufacturer':
+      case 'designer':
+      case 'property_owner': {
+        if (!item.company_submission_id) break;
+        const { error: updateError } = await supabase
+          .from('company_submissions')
+          .update({ ...(item_data as any), updated_at: new Date().toISOString() })
+          .eq('id', item.company_submission_id);
+
+        if (updateError) throw updateError;
+        break;
+      }
+      case 'ride_model': {
+        if (!item.ride_model_submission_id) break;
+        const { error: updateError } = await supabase
+          .from('ride_model_submissions')
+          .update({ ...(item_data as any), updated_at: new Date().toISOString() })
+          .eq('id', item.ride_model_submission_id);
+
+        if (updateError) throw updateError;
+        break;
+      }
+      case 'milestone':
+      case 'timeline_event': {
+        if (!item.timeline_event_submission_id) break;
+        const { error: updateError } = await supabase
+          .from('timeline_event_submissions')
+          .update({ ...(item_data as any), updated_at: new Date().toISOString() })
+          .eq('id', item.timeline_event_submission_id);
+
+        if (updateError) throw updateError;
+        break;
+      }
+      // Photo submissions handled separately due to complex structure
+    }
+  }
 }
 
 /**