how to check a debit memo is created against which particular receipt?

Hi,

I have a PO with one line, 100 qty

Now, one ERS Invoice is created  against this PO, Receipt NUmber 123 for 25 qty. ERS-INVOICE-101

Again  one ERS Invoice is created  against this PO, Receipt NUmber 124 for 50 qty. ERS-INVOICE-102

Again  one ERS Invoice is created  against this PO, Receipt NUmber 125 for 25 qty. ERS-INVOICE-103

now for the same line I have performed Return to Vendor (Return to Supplier) for all the three receipts/ 5 qty. i.e. 123-11, 124-41, 125-131

Now I can see these Debit memos of RTS source type in AP Screen, but from Backend How can I identify which debit memo is created against which receipt?