Country of Origin

Hi, I wanted to know the best practices around the Country of Origin Requirement. In my current client, the issue is say Supplier A ships part XYZ. They can procure XYZ from different countries. However since Supplier A is in a particular country, hence the Country of Origin is assumed to be from that country whereas the supplier procures it from multiple countries. Is Serial/Lot controlling the item the best solution? I do not think specifying the Country of Origin defined at Supplier Site or ASL level would be enough .

1 suggestion was to create multiple part numbers for each COO meaning XYZ from China, XYZ-A from US, XYZ-C from India etc!!