I use two references in the credit notes, I already create in "transaction references " option but i have to change manually the reference typing each reference.

Could you make a combo box like in the Direct invoice option?

Invoice
https://drive.google.com/file/d/1yhfVMKmfGdSmnxDgzfGUpj_QcXU4zWbK/view?usp=sharing

Credit note
https://drive.google.com/file/d/10W5RJCTPq79oBMhuP56yMOkdCMfRoDdG/view?usp=sharing