@ -83,7 +83,7 @@ class SaleOrderLine(models.Model):
@api.onchange('date_start', 'product_uom_qty', 'recurring_rule_type')
def onchange_date_start(self):
contract_line_env = self.env['account.analytic.invoice.line']
for rec in self:
for rec in self.filtered('product_id.is_contract'):
if not rec.date_start:
rec.date_end = False
else: