Note not working.

[Cranky Old Man]

The only thing that I can come up with, is to first insert this as the first category (and if you want to use single quotes instead, go ahead):

<CATEGORY Name="CustomStoryMain">
<Entry Name="Description">
This is a story description.
</Entry>
</CATEGORY>

...and then secondly, to have the Journal category come before the Messages category.
It shouldn't matter, but I don't know anything else.