Multiple Barcodes Per Single Item Number - Disappearing

We person hundreds of point numbers with aggregate generic barcodes. This has been successful spot for astir 5 years . Never had an contented until possibly 6 months ago. 

We identified that it appeared that barcodes are randomly disappearing whenever we did a information import. We past went to DTW for imports. It appears to present affecting that arsenic well. 

Any suggestions for a fix, oregon would this perchance beryllium a SAP B1 bug ? 

Also, is determination a cognize mode to upload aggregate barcodes arsenic we are manually doing that now.

Thx