This parameter will determine whether you use the order date (the purchase order create date) when finding the supplier agreement price or whether you should use the receipt date specified on the purchase order line. With this parameter set to the receipt date, you can pre-enter the desired purchase orders and they will use the correct supplier agreement, since there might be a supplier agreement with a start date later than today's date but before the receipt date of the purchase order line. The price effective date also affects which price is retrieved from the price list.
A supplier must have been entered.
The value defined on the supplier will be copied to the purchase order header where it cannot be changed.