Inventory Reservation Window

Number of days before the promise ship date that inventory reservation should be attempted.  The valid value of this field will depend on the value of the future reservation option flag in the Warehouse Description File.  If the flag is Yes (Y), the inventory reservation window should be numeric.  If the flag is No (N), the reservation window should be *ZEROS or *BLANKS.  The inventory reservation window is kept on the Warehouse File.