How often when you need to discuss a problem with a supplier, do you need to hunt around for your supplier issued account number.
While there are a number of other areas where information like this could be recorded, I believe a simple field within the buying details tab of a supplier's card should be available to include:
Customer Number / Membership Number etc.
Simple request surely?
"Include a field to record your suppliers account number they have allocated you"
Regards
Greg