So this is kind of a unique question, but I'm curious if anyone here as any insight. So a UPC code should be printed and stand for a single unique product....but what does everyone do with kits. The kit (for example), is sku 1800, which consists of physical part numbers 1800-1 and 1800-2. Do you UPC just the physical products? Or the kit only, or all 3? The complication comes from using a WMS, where every barcode on a product should be unique to the product it's on, and can't stand for a kit. It needs to be able to determine the physical product its on