Query to fetch sum of debit memos and credit memos for an original invoice

Summary

Am looking for a query to get sum of credit memos linked to original invoice ie Original invoice -HCS1 Credit memo-HCS2 as shown in below screenshots.

Content

I want to query to get sum of credit memos linked to original invoice ie
Original invoice -HCS1
Credit memo-HCS2

So now sum of credit memos here -1000 as only 1 credit memo is there

The credit memo is linked to original invoice through transaction number ie original invoice reference number in screenshot for credit memo is HCS1

similarly I want a query to get sum of debit memo amounts.

 

Functional Navigation:

oracle fusion-receivables-billing-search with Transaction number--go to actions in the top-click on view transaction details.