diff --git a/src/asquare.py b/src/asquare.py
index 126c0a6..d14a748 100644
--- a/src/asquare.py
+++ b/src/asquare.py
@@ -309,12 +309,13 @@ async def update_itm(item_id: str, lego_set: dict, item_data: dict = None):
             if variation_version is not None:
                 variation_obj["version"] = variation_version
 
-            # Build item object - DO NOT modify location settings
-            # Square will preserve existing present_at_all_locations configuration
+            # Build item object - MUST include present_at_all_locations at object level
+            # Square's upsert replaces the entire item_data, so we need to be explicit
             item_obj = {
                 "type": "ITEM",
                 "id": item_id,
                 "version": current_version,
+                "present_at_all_locations": True,  # Default to all locations to avoid conflicts
                 "item_data": {
                     "name": pw_name,
                     "description": f"{set_name} - {set_theme}",