Hi Anirban,
Can you please explain that which kind of rebate scenario you are looking .
normally rebate process says condition type will be determine in billing document with hep of requirement 24
komk-vbtyp ca vbtyp_fakt or "Invoices
komk-vbtyp ca vbtyp_anfo or "Credit / Debit requests
n rebate will have a/c key n as well as accruals key- its keeping a side amount of condition type separately for future in rebate settlement so ur rebate value will not posted in accounting directly it will reserve separate in another a/c with help of accruals GL a/c no.
Thanks