Permanent versus Project-Scoped UDFs
 
 
You can either define a new User defined filter for your current report or keep it permanently in dataset (in order to do this mark 

).
 
- 
New UDFs set as permanent can be used by other users who receive access to them (read more in  Managing access to UDFs).
- 
New UDF which is not set as permanent is available only in the report where it was created.