When a message occurs for which USER-DEST-1 ...USER-DEST-4 has been defined as the message destination, UTM creates an asynchronous job to this message destination internally. This asynchronous job is assigned the user KDCMSGUS and the LTERM partner KDCMSGLT as the originator. If the asynchronous job is rejected because, for example, the message destination is locked (STATUS=OFF), the message is lost to the message destination. If a message is created for this message destination again, UTM tries to create an asynchronous job again.
If an asynchronous TAC is generated as the message destination, UTM starts the program assigned to the TAC every time the relevant message is created (i.e., different to MSGTAC programs – only one message can be read with FGET in a program run).