How to restrict Credit Notes to refunded/reversed Invoice?

Question

To refund an invoice a credit note is created. However even after refund, there is an option of creating a credit note against that invoice. How to restrict creating a credit note against already refunded invoice?

Cybrosys Techno Solutions Pvt.Ltd · Answer

Hi,
Try this code:
from odoo import models,api
from odoo.exceptions import ValidationError

class AccountMove(models.Model):
_inherit = 'account.move'
@api.model
def create(self, vals):
credit = self.env['account.move'].search(
[('reversed_entry_id', '=', self.id)])
if credit and self.id:
raise ValidationError(
"Cannot create a credit note for an already refunded invoice.")
return super(AccountMove, self).create(vals)

Hope it helps

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