Activating MFS output formatting for ISC

MFS output formatting occurs when an output message has an associated message output descriptor (MOD).

The MOD is supplied in one of the following ways:

The application program supplies a MOD name with the output message.
The input message is processed by a message input descriptor (MID) whose definition specifies a MOD name for output formatting.
The output message is a message switch that is created by a MID whose definition specifies a MOD name for output editing.

If no MOD is associated with the output message, no MFS editing occurs. Values for the ATTACH and SCHEDULER parameters are the default values that are defined under these respective header types.

You can use the MOD to specify the next MID name to be used to format input as the result of output. In an ISC session, IMS cannot control the relationship between formatted IMS output messages and subsequent input messages. Therefore, involvement is required by the remote subsystem or user application program to ensure that the proper MID name is used for input MFS formatting. The ATTACH and SCHEDULER RDPN/DPN parameters perform the ISC function of externalizing the next MID on output and invoking MFS formatting on subsequent input.