SAP Message AO724 - Selection list box number &1 already has a standard value

Diagnosis
You want to maintain a selection criteria as a standard value (default)for selection list box number &v1& of the selection criteria.
However, you already selected a criterion as a standard value for thislist box.

System Response
Maintaining the standard value is not possible.

Procedure
If you want to maintain a new standard value, first delete the oldstandard value.