Ability to Restrict Attachment Placement to Header or Line Level in Purchase Requisitions?

Summary:
We have a customer requirement to control where supporting documents are uploaded in Purchase Requisitions, either exclusively at the header or at the line level. The customer needs to enforce a consistent attachment policy across requisitions.

Content (please ensure you mask any confidential information):
A customer has reported that requesters currently upload supporting documents inconsistently some at the header level and others at the line level of the Purchase Requisition. This lack of uniformity leads to confusion among approvers and buyers, making the approval and procurement process less efficient.

The client is requesting a configuration option or restriction that would