[FIX] l10n_fr_pos_cert: set decorator on unlink

As unlink from models is still written in old API, needs to set the decorator to
avoid an error when trying to delete a bank statement

Closes #23999

addons/l10n_fr_pos_cert/models/account_bank_statement.py

@@ -6,6 +6,7 @@ from openerp.exceptions import UserError
 class AccountBankStatement(models.Model):
     _inherit = 'account.bank.statement'
 
+    @api.multi
     def unlink(self):
         for statement in self.filtered(lambda s: s.company_id._is_accounting_unalterable() and s.journal_id.journal_user):
             raise UserError(_('You cannot modify anything on a bank statement (name: %s) that was created by point of sale operations.') % (statement.name,))
@@ -15,6 +16,7 @@ class AccountBankStatement(models.Model):
 class AccountBankStatementLine(models.Model):
     _inherit = 'account.bank.statement.line'
 
+    @api.multi
     def unlink(self):
         for line in self.filtered(lambda s: s.company_id._is_accounting_unalterable() and s.journal_id.journal_user):
             raise UserError(_('You cannot modify anything on a bank statement line (name: %s) that was created by point of sale operations.') % (line.name,))