If you have agreed with your vendor on a different delivery date, update the delivery date on the purchase order.
Steps
Go to Accounts payable > Purchase orders > All purchase orders.
In the list, select the desired record.
Expand the Purchase order header section, if this not expanded.
Click Edit, if the purchase order is in view mode.
In the Delivery date field, enter the new delivery date.
Click Save.
Select Yes in the Update Delivery date field.
Click OK.
Close the page.
Go to Default dashboard.