update
Used bar codes apart from basic information about a country (590) and a company (0843) include information about product name (e.g. baby set PL marked as 03) and its marking (e.g. 420) The last digit is a control one.
It exactly refers to the given symbol by us (PL 420) and let to reorder the product in two ways: using a symbol or a bar code. If a customer wish so, we can share the full data regarding clothes marking.