Rebate Return

Dear Gurus

I have run rebate cycle ord-del-billing ( with rebate agreement condition of customer)

now customer wan return back some defective material so created return order reference

to above billing and delivery and credit memo,when i save credit memo automatically

value of rebate condition for customer changes.

( as if date is same for all process and after creation of normal rebate cycle i have changed

condition rebate value in agreement,so when i save credit memo automatically its updating

new condition value,which should not happen because we are crating with reference to billing.)

regards

J>A