Description of EAN-2 Add on
For the codes GTIN-13 (EAN-13), GTIN-12 (UPC-A) and GTIN-8 (EAN-8), additional codes with 5 digits or 2 digits can be used. The 2-digit code is used in particular in the newspaper industry, while the 5-digit code is used in particular to indicate the price of books in conjunction with the ISBN barcode.The EAN-5 and EAN-2 supplementary codes are only used alongside GTIN-13, GTIN-12 or GTIN-8. This is why they are often referred to as add-ons. Usually you place them after the main code.
Examples:


GTIN-13 with add-on code EAN-2
GTIN or EAN - what is the difference?
Both terms basically mean the same thing. However, the term EAN (European Article Number) has been officially replaced by GTIN (Global Trade Item Number) to ensure uniform labeling worldwide. While the EAN and specifically the EAN country code was originally developed for European standards, GTIN covers international requirements and offers more precise, globally recognized terminology. See GS1 prefixes.
Both terms basically mean the same thing. However, the term EAN (European Article Number) has been officially replaced by GTIN (Global Trade Item Number) to ensure uniform labeling worldwide. While the EAN and specifically the EAN country code was originally developed for European standards, GTIN covers international requirements and offers more precise, globally recognized terminology. See GS1 prefixes.