How to implement a custom check rule for Purchase Order/Blanket Purchase Agreement submission

Summary:

We would like to know if there is any way to check and regulate the submission of a Purchase Order/Blanket Purchase Agreement based on a specific attribute (Flexfield) stored in Supplier Header. This is a key aspect of our customer that needs this specific configuration in order to verify some important points related to a Supplier before to submit both Purchase Order and Blanket Purchase Agreement.

Content (required):

According to the information stored in a specific flexfield in Supplier Header, it regards the expiration of chamber of commerce certificate, the system should allow/disallow the Purchase Order/Blanket Purchase Agreement submission raised for a specific Supplier.