How to do return excise invoice based on..

Hi Frnds,

Our business process is Order-delivery- pgi- Invoice( with billing type (JEX)-J1IIN -branch billing with Billing type F2..

Now i have to do return for this process.

Am thinking the way is

J1IH-wheather i have to do with reference to JEX or F2 or Cerdit memo.

Return order with ref to F2-delivery- PGR- Credit memo.

My question How to do J1IH with reference to F2 or JEX or Credit memo.

For Billing JEX accounting document doesn't exits.

Please Give me ur valuable suggestions..