In Uzbekistan, trade between companies is documented with electronic invoices. Documents and receipts list products with a code from the national catalogue of goods and services, and for marked goods the marking codes may be recorded as well.
In practice many errors come from messy product records: the same item entered under different names, with the wrong code or unit of measure. Linking each product record to its barcode and catalogue code keeps the data identical at receiving, at sale and in documents.
Check the exact rules and the choice of codes with official sources and your accountant. BDB helps set up scanner-based product identification in the warehouse and at the checkout.