diff --git a/src/asquare.py b/src/asquare.py
index 356a6c9..2eb9ba1 100644
--- a/src/asquare.py
+++ b/src/asquare.py
@@ -286,26 +286,42 @@ async def update_itm(item_id: str, lego_set: dict, item_data: dict = None):
             print(f"[@DEBUG] Fresh variation version: {variation_version}")
             print(f"[@DEBUG] Final category_id for upsert: {category_id}")
 
-            # Build upsert body
-            variation_obj = {
-                "type": "ITEM_VARIATION",
-                "id": variation_id if variation_id else "#TEMP_VARIATION_ID",
-                "item_variation_data": {
-                    "item_id": item_id,
-                    "name": "Regular",
-                    "pricing_type": "FIXED_PRICING",
-                    "price_money": {
-                        "amount": price_in_cents,
-                        "currency": "USD",
-                    },
-                    "sku": set_number,  # LEGO set number (e.g., "10338")
-                    "upc": set_upc if set_upc else None,  # Barcode/GTIN
-                },
-            }
+            # Preserve existing variation and update only what we need
+            if variations:
+                # Start with existing variation to preserve all fields
+                variation_obj = variations[0].copy()
+                variation_data = variation_obj.get("item_variation_data", {}).copy()
 
-            # Include variation version if it exists (required for updates)
-            if variation_version is not None:
-                variation_obj["version"] = variation_version
+                # Update only the fields we want to change
+                variation_data["price_money"] = {
+                    "amount": price_in_cents,
+                    "currency": "USD",
+                }
+                variation_data["sku"] = set_number  # LEGO set number
+                variation_data["upc"] = set_upc if set_upc else None  # Barcode/GTIN
+
+                variation_obj["item_variation_data"] = variation_data
+
+                # Update version if exists (required for updates)
+                if variation_version is not None:
+                    variation_obj["version"] = variation_version
+            else:
+                # Create new variation if none exists
+                variation_obj = {
+                    "type": "ITEM_VARIATION",
+                    "id": "#TEMP_VARIATION_ID",
+                    "item_variation_data": {
+                        "item_id": item_id,
+                        "name": "Regular",
+                        "pricing_type": "FIXED_PRICING",
+                        "price_money": {
+                            "amount": price_in_cents,
+                            "currency": "USD",
+                        },
+                        "sku": set_number,
+                        "upc": set_upc if set_upc else None,
+                    },
+                }
 
             # Get the full existing item_data and modify only what we need
             # This preserves ALL existing fields (location settings, tax, etc)