Prob. in Implement User Exit for wrong calculation of Surcharge during MIRO

Question

Dear All,
In our system the calculation of Surcharge is wrong during MIRO.
So i write this issue to the SAP, the below solution is provided by them :
Use the user exit 'J_1I7_USEREXIT_PROCESS_TKOMV' to redetermine
the additional VAT condition type value. This user exit will be
called after the FM 'J_1I4A_TAX_CONDITIONS', where the
redetermination of the VAT will take place on the basis of
the changed excise duties.
So, userexit can be implemented by CMOD and SMOD, but this userexit actually a Function Module.
But now the problem is how can i implement the 'J_1I7_USEREXIT_PROCESS_TKOMV' function Module.
Regards,
Nitin Garg

Answer 1

Dear,
Thanks. I already make a enhacement in this function Module and write the below code:
ENHANCEMENT 1  ZMIRO.    "active version
DATA : WA_XKOMV TYPE KOMV.
DATA : WA_KBETR TYPE KOMV-KBETR,
       IDX TYPE SY-TABIX.
LOOP AT XKOMV WHERE KSCHL = 'ZSUR'.
  IDX = SY-TABIX.
  WA_KBETR = XKOMV-KBETR / 10.
  READ TABLE XKOMV INTO WA_XKOMV WITH KEY KSCHL = 'JVRD'.
  XKOMV-KWERT = WA_XKOMV-KWERT * WA_KBETR / 100.
  MODIFY XKOMV INDEX IDX TRANSPORTING KWERT.
  ENDLOOP.
ENDENHANCEMENT.
ZSUR is a custom surcharge condition type. But still surcharge is wrong calculated.
Nitin Garg.