Diagnosis
You want to change a filter (a view of a structure) or a test plan, butit is being generated by the system. You cannot change the filter untilgeneration has finished.

System Response
The filter change is cancelled

Procedure
Try again in a few minutes.
In rare cases, when a test plan generation is cancelled, this messagemay still be sent hours later In this case, reset the generation lockmanually, under 'Utilities -> Unlock Filter Generation' in thetransaction 'STWB_2'.