Invoice Related List - Credit Notes

Invoice Related List - Credit Notes

Hi ZOHO Community!

As far as we can see there isn't a way of referencing a Credit Note against an Invoice that is native to Books. You can see it in the Comments & History section and also in the SO byway of the canceled items but not in the body of the Invoice itself. So we thought it could be possible to add it as a Related List at the bottom of the Invoice? 

The native example uses an Invoice example however I can't find examples or documentation on how best to switch this over to Credit Notes. Ideally we'd just like to see the Date the Credit Note was raised, its number, its status, the amount and the balance. All of these fields are available in the API documentation, but I can't see how to call from credit notes to get them. 

Any suggestions greatly appreciated