AK1 Functional Group Response Header
To start acknowledgment of a functional group
Functional Identifier Code
Code identifying a group of application related transaction sets
AK101 is the functional ID found in the GS segment (GS01) in the functional group being acknowledged.
Group Control Number
Assigned number originated and maintained by the sender
AK102 is the functional group control number found in the GS segment in the functional group being acknowledged.