Hi,
KKAG0001 is the user exit for RA for ps you can see it smod/cmod transaction whether it calling to functional module as below
EXIT_SAPLKKAG_001 ; Customer-Specific Postprocessing of Auto. Calculated Results
EXIT_SAPLKKAG_002 : Customer-Specific Determination of Planned Values/Valuation
EXIT_SAPLKKAG_005 : Customer-Specific Postprocessing of Plan Assignment of Depen
Regards,
Sanjeev