Planning - Cannot Add a Plan A

Q.  Why does Agvance not allow a Plan A to be added in Agvance Planning.

A.  In this instance, Plan A already exists. The next available letter defaults, but any letter may be selected that is not already being used for this field. To use Plan A, review the existing Plan A to see if it is still needed. If it is not needed, delete the plan, and then A will be available to use.