How to enable supplier acknowledgement only for BPA's and not for other purchasing documents.

Summary:

Client wants supplier acknowledgement only on BPA's but not on other purchasing document. How can this be acheived?

Content (required):

Client wants supplier acknowledgement only on BPA's but not on other purchasing document.

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

23A

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