BWC - Update Contract Terms/Update Contract Details/Additional Contract Template - Applying this tem

During the authoring of the procurement document, the contract template can be added, dropped, or replaced.  once the document is approved, the contract template cannot be added, dropped or replaced.

In Buy Work Center, I select the PO, Update, Update Contract Terms, Update Contract Details. There is the option for "Additional Contract Template" with a note that "Applying this template will add clauses and deliverables to the existing terms."

When I add the 2nd template and to go Contract Expert, the additional contract template rules/questions are not being asked.  When I go back to update Contract Details, the Additional Contract Template field returns to a blank.