X'3000' MESSAGE PREFIX SIZE INVALID

Explanation
 Either the total prefix size or one or more of
the prefix segments of the message has an invalid length.

Programmer response
 Locate the message being inserted
in the I/O area. The segment address is in REG1 in the REG14-12 save
area. The total prefix size is at offset 10 hex in the message. The
current prefix segment address of the prefix segment being checked
is in REG7 in the REG14-12 save area. The prefix segment length is
the first two bytes. The prefix ID (MSGSIID) is the third byte. Locate
this ID in the QLOGMSG DSECT and verify the size. If the message was
obtained from a supported IMS system
release, then this is probably an IMS internal
error.