Epicor10 - Prevent Subcontract PO Suggestions

This may be a silly question, but I don’t see a specific means of preventing subcontract PO Suggestions from generating for a Manufactured Part.

The Generate PO Suggestions is checked and read only by default.

Any one know a way to block it?

What is the business case here? Why do you not want the suggestions? Note that you could assign a special buyer that receives all the SC POs, and then not show anyone these suggestions.