Running TMSUDSNB with the following SYSIN and getting RC=12.
//SYSIN DD *
SHUTDWN=shutdown password
DSNB nnnnnn,NOVER
REP NEXT=nnnnn
/*
TMSUDSNB output shows
xxxxx SYSTEM SHUTDWN VALUE REQUIRED-INCORRECT SHUTDWN VALUE SPECIFIED
Release : 14.0
Component : CA 1 Tape Management
CIRCUMVENTION: rerun TMSUDSNB and specify 2 equal signs instead of 1 after the SHUTDWN control statement;
SHUTDWN== instead of SHUTDWN= followed by the SHUTDWN value from your TMOOPTxx member
Permanent solution is to apply CA 1 APAR RO98303