I think the key question here is: are you using GS1 identifiers? If not, I don't think it'd make much sense to throw a non-GS1 identifier in there and expect

I think the key question here is: are you using GS1 identifiers? If not, I don't think it'd make much sense to throw a non-GS1 identifier in there and expect anyone else to be able to use it. Or is this just internal?