from odoo import models class AccountMoveReversal(models.TransientModel): _inherit = 'account.move.reversal' def _prepare_default_reversal(self, move): """When reversing an invoice, set the greece correlated move field on the new credit note""" res = super()._prepare_default_reversal(move) if self.country_code == 'GR' and move.l10n_gr_edi_mark: res['l10n_gr_edi_correlation_id'] = move.id return res