Hello Mark, one example: I have BCC named "Article. Identifier". This "Identifier" do not have any restrictions. But sometimes, I will use this "Article. Identifier" for an EAN.UCC-13 with a fixed length of 13 digits. Therefore, it will be an advantage to restrict the length of the derived BIE like: EAN-13. Article. Identifier length= 13 Kind regards, Gunther