IBM SC33-1683-02 - Manual (Page 187)

UEPNRTE
Address of 1-character flag indicating whether or not the message
can be rerouted by XMEOUT. The possible values are:
C'0:' The message can be routed.
C'1:' The message cannot be routed.
Return codes
UERCNORM
Continue processing.
UERCBYP
Suppress the message for all destinations.
XPI calls
WAIT_MVS can be used. Do not use any other calls.
The sample XMEOUT global user exit programs
CICS supplies the following sample programs, which show you how to use the
XMEOUT exit to suppress or reroute messages:
DFH$SXP1
Suppress a message by message number
DFH$SXP2
Suppress a message by destination route code
DFH$SXP3
Suppress a message destined for the CSCS transient data queue (which
receives signon and sign-off messages)
DFH$SXP4
Reroute a console message to a TDQ
DFH$SXP5
Reroute a TDQ message to another TDQ
DFH$SXP6
Reroute a TDQ message to a console.
message domain exit
Chapter 1. Global user exit programs 155