What steps should I take if a product shows as out of stock despite available inventory?

If a product appears as out of stock even though the supplier feed shows available quantity, first confirm that the feed is updating the correct Shopify location. Stock Sync updates stock at one selected location per feed, so verify that the product is stocked at that location and that the feed's location setting matches it. If a product is stored at multiple locations, select the location whose inventory should be synchronized.

Next, verify the mapped quantity and product identifier. In Step 2, check the Quantity field and its Smart Settings, then choose the appropriate option, such as Available Quantity or Unavailable Quantity, and map it to the corresponding source column. Confirm that the SKU or barcode mapping uniquely matches the product in your store. If supplier article numbers do not match Shopify SKUs—for example, because of leading zeros or different identifier formats—use the stable barcode instead, if it remains consistent in both systems. Duplicate SKUs or barcodes can also cause multiple variants to receive the same quantity. If one supplier item is duplicated in Shopify and both products should update, confirm that they share the same identifier and quantity behavior before changing the feed settings.

If the quantity is correct in the feed but still appears as 0 in Shopify, review inventory tracking, inventory policy, and any changes made directly in Shopify. Check the product's Shopify inventory adjustment history to determine whether another app or process changed the quantity or product status. If the product is not assigned to the selected location, enable it at that location first. Stock Sync can auto-add stock to a selected location when that option is enabled. For a product that must appear at a location with quantity 0, you may need to update it with a positive quantity first so the location is activated, then run the feed again with quantity 0.

Also check filters and rules. A SKU or product filter can exclude a product from the update, while a quantity rule or formula can set stock to 0 under certain conditions. If the product is missing from the feed, the Out of Stock Strategy may set it to 0; this option is in Step 4: Advanced Settings, requires the Quantity field to be mapped, and should be limited with Store Product Filters when multiple suppliers or locations exist. If the supplier changed a column name or file structure, update the mapping to match the new header. For example, if a supplier renames a quantity column, remap the field to the new header (such as FREE STOCK) rather than the old column name.

After confirming the identifier, quantity mapping, location, filters, and settings, use Preview Sync, review the results and Change Log, and then run the feed again to apply the update. If the feed runs on a schedule, verify its execution in the History tab; automation can be configured to run twice daily.

Updated on: 05/08/2026