It can be helpful for debugging if you use a predefined message format.
If messages that are presented to the user have a unique message identifier that identifies the component or extension within IBM Director that issued the message and a unique message number, you can more easily trace the message to it's source.
The message format proposal is:
The message identifier is 10 characters in length and has the format: XXXMYY###Z
where,
For example,
Message number range is 000 - 999
For example, a valid IBM Director zSeries message identifier would be: DNZZVD005E