[15.0][account_invoice_refund_line_selection] Error in "Down Payment (percentage)" invoices and line_ids

[enginulger]

Problem1:
V15 account_move_reversal.py L55-L75 Sales -> Create Invoice -> Select "Down Payment (percentage)" and create a percentage invoice. Then, when creating a reverse invoice with "Add Credit Note", it gives an error. The line of code causing the error is specified in the link.

Solution1:
V16 account_move_reversal.py L54-L56 replace it with the specified line of code.

========================================================

Problem2:
V15 account_move_reversal.py L76 line_ids can be defined in another module.

Solution2:
"res["line_ids"] = lines"replace with below

if res.get('line_ids',''):
lines += res["line_ids"]
res["line_ids"] = lines