Most host message IDs in Rational Developer for System z have the format prefixnnnnL, where prefix is a prefix such as CRAZ or FEK, 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.
For additional information on the Rational Developer for System z client messages, see the product information center (http://publib.boulder.ibm.com/infocenter/ratdevz/v8r0/index.jsp?topic=/com.ibm.etools.rdz.messages.doc/reference/rdzmesgs.html).