In Odoo sales process we use EAN system that is an advancement of UPC, adding an extra digit to the beginning of UPC number. This expanded the number of unique values to 10 trillion. EAN-13 barcodes indicate the country in which the company that sells the product is based which may(not) be the same as the country in which the good is manufactured. All products can give shorthand and quick facts on basis of product bar-codes. When at times product are Identical you can differentiate them based on their internal reference. Internal references are unique values that sets the product different from others.
Odoo can hold all these types of information you can follow navigation- Purchase>> Products>> Products- Information tab
