What is the earliest available date?

The earliest date is derived from the item source lead time. The earliest available date is determined by adding the item source lead time to the current date. If you don't configure purchasing to use the earliest date, the due date field will be left blank when entering purchase order line items—requiring users to enter the date manually.

Note: The earliest date configuration applies only to manually-entered purchase orders. This option does not impact the scheduling of purchase orders generated by the MRP planning system.