To indicate that the equipment is or is not to be released.
Code signifying whether or not the shipment information transaction set includes instructions for pick-up and movement of the shipment. (This code provides a means for the shipper to transmit billing data along with the movement instructions, transmit billing data ahead of the movement instructions, or follow movement instructions with complete billing data at a later date.)
If M301 contains code value `S' or `R', then M302 is date of release. If M301 contains code value `U', then M302 is estimated date of release.
Time expressed in 24-hour clock time (HHMMSS) (Time range: 000000 through 235959)