The Check Locked System Value command checks a system value to see if it is
locked by the DST/SST function. This prevents certain system values from being
used by CHGSYSVAL (or the Change option on WRKSYSVAL). The escape message
TAA9896 is sent if the DST/SST function has been used and the system value is
one that is on the list that may be locked. Otherwise, the command completes
normally.