Most client message IDs in Rational Developer for System z have the format CRRZxnnnnL, where CRRZ is the prefix for Rational Developer for System z, x is the component identifier, nnnn is a message number unique to that message, and L is the message level. The message level can have values S for severe errors, E for error, W for warning, and I for informational.
This additional information is also included in the information center for Rational Developer for System z (http://publib.boulder.ibm.com/infocenter/ratdevz/v8r0/index.jsp?topic=/com.ibm.etools.rdz.messages.doc/reference/rdzmesgs.html).