When you select Delivery reliability, you can choose the date format used for the delivery period under Format. If the delivery period for a subcontract was entered in the YYWWD format, or in date format, the accuracy of delivery reliability will be in days. If the delivery period was entered in the YYWW format, the delivery reliability accuracy will be in weeks. You selection here will also affect the Allowance for on-time deliveries, whether the allowance shown should be in days or in weeks.