fix issue with multipe account in fix budget

odex25_purchase/purchase_requisition_custom/models/purchase_order.py

@@ -633,6 +633,9 @@ class PurchaseOrderCustom(models.Model):
                         raise ValidationError(
                             _("This product has no expense account") + ': {}'.format(rec.product_id.name))
                     budget_post = self.env['account.budget.post'].search([]).filtered(lambda x: account_id in x.account_ids)
+                    if len(budget_post.ids) > 1:
+                        raise ValidationError(
+                            _("The Expense account %s is assigned to more than one budget position %s")%(account_id.name,[x.name for x in budget_post]))
                     if analytic_account:
                         budget_lines = self.env['crossovered.budget.lines'].search(
                             [('analytic_account_id', '=', analytic_account.id),