Agreements no longer listed after order is saved

We have created an agreement with a quantity for a customer.

We create an order, and the agreement appears in the Select Agreement screen.

The order is saved.

Later a new agreement is created, and a decision is made to change to the new agreement.  When the sales order is opened, and the Select Agreement page is displayed, neither agreement is visible.

Changing the Agreement number results in the message, "No agreements found"

The order can be saved with the original agreement number.