The data validation on the Barcode entry field of the Ninja Lister will not allow the entry of Manufacturer's Part Numbers.

The entry of alphabetical characters is ignored/disallowed, and the entry must conform to barcode format or the error Length of Barcode must be 10, 12 or 13 symbols is generated on attempting to save the listing.

So entries of MPNs such as M876354S, and BK67891 are impossible.