Selection list box number &1 already has a standard value

What causes this issue?

You want to maintain a selection criterion as a default value for
dropdown box number &V1& of the selection critieria.
However, you already selected a criterion as a default value for this
dropdown box.

System Response

It is not possible to maintain a default value.

How to fix this error?

If you want to maintain a new default value, first delete the old
default value.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.