Allow duplicate carton barcodes to be added to a product

Mintsoft currently allows duplicate barcodes to be added to products if the "AllowDuplicateBarcodes" setting against the client is ON. This doesn't seem to apply to a products carton barcodes for some reason. The issue we have is if we have two products using the same barcode they will have the same carton barcode as well which means we can only scan in cartons for one of them. The real life example of this is where we setup two products where one is the normal product and one is the same product but with a reduced shelf life.