EXIT_SAPLEINS_001

I am looking to use the exit EXIT_SAPLEINS_001 in BI for an enhancement of 2lIS_02_SCL (EKET-WAMNG). My questions are:

1. Is this exit specific for BI enhancements or also for SAP/other enhancements?

2. In order to use this exit do I need to carry out some activation or steps otherwise. Have written the logic in the exit but it is not called (have checked in RSA3 Debug)

Thanks