What does "Vendor Adjustable" mean?

When entering a furnished material, proof, or other task, clients now see the option to make the dates vendor adjustable. By clicking this box when creating a task, the client gives the winning vendor the immediate option to adjust important dates on the job without the need for a change order. This box does not appear during the bidding window, nor does it appear on deliveries. Any changes after the vendor has made any appropriate changes to the dates will need to be done via change order.