About Valid Due Dates
When an order is created, you can specify valid due dates only.
A valid due date is any date in which employees will be on hand to ship, or receive, to the order. When new orders are created, or when you change the due date of an existing order, the system checks to see if it is valid. If it is not, an error displays and you must specify a valid date.
Invalid due dates can be updated manually, or automatically by using the Change CO Line/Release Invalid Due Date Utility form Change Purchase Orders Due Date forms.