This command message is initiated by the 3M SelfCheck system when it is requesting to checkin materials. It may also send this command when an item substitution is detected or item removal prior to desensitization occurs during a checkout transaction. This command will then check the item back into the library ACS.
####################################################
This message is used by the SC to request to check in an item, and also to cancel a Checkout request that did not successfully complete. The ACS must respond to this command with a Checkin Response message.