>>> Anybody know the logic for the JC Penney store number check digit
>>> calculation? Or at least the name of the convention they use?

>> UPC? SSCC-14/18? The one with 20 total (I think that's SSCC-20)?

> No, it is not the UPC or the SSCC. It is the store number. 4 digits without
> check digit. They used to send the complete 5 digits that included the check
> digit, now they are just sending 4.

That has GOT to be documented by JCP somewhere.  Worst case they have a "vendor 
EDI support email/phone number" with someone who can 
give you an answer... even if the answer is "it's not a standard formula check 
digit, it's (something else)."

Michael C. Mattias
Tal Systems Inc.
Racine WI
[email protected] 



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