RMA for KIT items

I have done the RMA for KIT items, All the included items are returned to inventory on making the receipts against RMA. But credit note for Kit item is not created.

Steps:

1- Defined a Kit item

2- Define bill of material for Kit item both in master and shipping org (Five inventory items as child items in BOM)

3- Created sales order for Kit item, all included items added while book the order

4- Pick Release, Pick Confirm and Shipped the order

5- AR invoice created

RMA steps:

1- Created RMA by referencing the above sales order

2- All 5 included items are added in RMA, one by one.