How to handle supplier id changes on procurement contracts

V9.2

PT 8.54.18

We are trying to change the supplier id on an existing contract that has item numbers on the contracxt.  Upon trying to change the supplier id, user is getting "Cannot change supplier here-contract line has been created."  "...you have to delete all the supplier item lines before changing to a new supplier."

The option to minus and remove the lines is not available on the new version.  However the red X to cancel is.  After cancelling all the lines this message still appears.  Doesn't matter if items are associated to the new supplier or discontinued.

The only thing that seems to work is (prior to creating a new version) open the current version, minus out the items (this is available here but not on the new version), change status to Approved/save.  Then create a new version.  Then I'm able to change the supplier.