Hi everybody,
I'm a new zenner, so please forgive the ignorance:

Overview:
If you are a 'brick and mortar' retailer becoming 'click and mortar,' you most likely will have POS (point of sale) system at your retail location. Each product will then be equipped with not only UPC, but possibly with vendor's SKU, manufacturer's ID, etc. (you may buy one product from various vendors, thus each vendor will have a unique SKU, and even sometimes more than one UPC: depending where the product comes from - and so on). On top of this the POS will have its own unique ID...

So, to make it short(er), for better inventory management, each product needs several identification fields.

Quest for Solution:
Such a fields are bread and butter in retail - I tried to find something on this issue, but if I do understand it correctly, there is no solution at this time (or is it?). Ideally, I would like not to substitute any fields (i.e. some recommendation I read, to substitute manufacturer fields).

Any Ideas:
I'm curious, how some of you with similar needs deal with that issue - could you please kindly respond with your ideas - thanks.