SAP Message BROWSER011 - Filter &1 is already locked by &2

Diagnosis
You want to create the filter &V1&.

System Response
The system checks whether an employee is carrying out the followingwork step in Customizing: Define filter.

Procedure
Because user &V2& is carrying out this work step, you cannot define anew filter at this time.
Define the filter after user &V2& has completed the work step.