You are filtering on navigation attribute &1

What causes this issue?

You are using a navigation attribute in your filter criteria. The set of
extracted records can change over time. If you execute the DTP again,
the result of the extraction might change even if the source has not
changed at all, due to potential changes in the values of navigation
attributes.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.