PRODUCT321: Barcode ambiguous
What this means
More than one product matches this barcode.
WCPOS cannot pick between them safely, so nothing was added. Search for the product by name, and give each product a unique barcode in the store to fix the clash.
Your data
No order or product data is affected. If this persists, ask your store administrator.
Troubleshoot
At the till: search for the product by name to complete this sale — the scan added nothing because the barcode matches more than one product.
The log entry records the scanned code and how many products matched; searching the POS for the barcode value shows which ones they are.
On the store (WP Admin): give each of those products its own unique barcode, then rescan to confirm only one match remains.