The GS1 system provides several different types of barcodes. The barcode you need to use will depend on what the product is and where it will be scanned, i.e. whether it is scanned at the point of sale or in a distribution centre. See page 13 of the Basic User Guide for a flow chart that will guide you to the correct choice of barcode.
Version 1.0 – Updated 25th October 2014