Hello,
Regarding bill payment composition in Odoov14, please see the situation below: 

I have a bill ($100) and a credit note (-$20) related to the bill;

I would like to make the bill payment by check and apply the credit note.
Bill = $100Payment: $80 by check and $20 credit note

The payment receipt view is:

Bill $100 (original amount), Amount paid  $80, Balance $0.00 

The check description is:

Invoice amount (original amount) $100, amount due $0.0, Payment $80.

I would like to add in the check description and in the payment receipt the trail of the credit note as well.

How can I do that?