As a customer/user, do you have the right of approval over your changes to the supplier’s product including fabrication, assembly, testing, marking and packing processes?
Depending upon your relationship with the supplier, e.g., you are a large volume,
consistent purchaser or influential member of the supply chain), you may have the right to approve or reject proposed changes to the supplier’s product. If not, and changes are important to you or your customer, you may have the option of requesting notification of changes. Keep in mind that this notification may be concurrent with the change or even after the fact.