FBA shipment, stock doens't match ASIN

Hi all,

I have had an email from Amazon this morning suggesting that the barcode of the stock i have sold does not match that of the ASIN. They have suggested creating a new listing which is ridiculous and state that the stock will be received as unsellable in 3 business days if not resolved.

I have sold the exact same stock on the exact same ASIN via FBA for well over a year now with no issues, so i am struggling to understand how this can all of a sudden be a problem.

I have opened a contact request but no doubt will get some generic automated rubbish back from Amazon. Has anybody had a similar experience of this and are able to shine a light?