After upgrading Datacom software to the latest version, the MUF gets a U0004 abend during shutdown:
DB00239I - MUF TERMINATION, START NORMAL EOJ
DB00202I - MULTI-USER DISABLED
DB00501E - OPEN ERROR - RETURN CODE 56 (001) CXX=
IEF450I ADMUF ADMUF - ABEND=S000 U0004 REASON=00000000
IEF404I ADMUF - ENDED
$HASP395 ADMUF ENDED - ABEND=U0004
The RC 56 (001) means the Master List DBMSTLST load module was generated for an earlier release. This module comes from the CUSLIB library in the STEPLIB and is created during the installation process.
Review the STEPLIB of the failing job to be sure that the correct version CUSLIB is there, and that you have unexpected copies of DBMSTLST in other libraries in the concatenation.
As always, please contact Broadcom support for Datacom if you have further questions.