I'm trying to use the auto-numbering feature in magicdraw to label TBXs automatically, and I was hoping that I could use an expression to mark them as something like "RQMTXX-TBD-YY", but it is difficult to figure out how that works with my lack of experience with this system specifically. The documentation is not very helpful, as all it has to say about the 'expression' sequence for numbering schemes is:

"Select this type to use a Binary (Reference to a code class) expression for calculating a value of the number part."

And I can't google what a binary expression is in this context, because I only get answers related to literal binary coding.

If anyone knows how it works and can provide any guidance or details, that would be appreciated. Alternative workarounds that don't require just doing it by hand would also be nice.