approval on internal supplier profile changes

Summary

I have an idea to prevent supplier internal changes with no need for approval .

Content

Hello ,

i have a business requirement from one of the customers ,

He have two people with supplier manager role .

Buyer A and Buyer B .

Buyer A has to go to supplier Profile to promote him to spend authorized from prospective status . but we need to prevent this user from editing Supplier Profile .

Buyer B have the authority to amend the supplier profile , no problem .

Now based on these cases i have a requirement to restrict Buyer A Not to amend Just Promote , and based on latest updates , we can not create a custom role that seperated the supplier maitain priviliges and the promote supplier button .