Can we restrict suppliers from requesting any changes in the existing purchase order?

Summary:

The business never got any request from the supplier until now, but now one of the suppliers requests changes in the amount on the purchase order. Business wants to restrict suppliers from requesting any changes to the purchase order.

Content (required):

Oracle Fusion Purchasing Cloud Service

Version (include the version you are using, if applicable):

23C

Code Snippet (add any code snippets that support your topic, if applicable):