Some years ago we had this ticket:
https://sourceforge.net/p/tei/bugs/299
which was supposed to result in the removal of "mandatory when applicable" wherever it occurred, on the basis that it's pretty much meaningless. However, it still appears in attDef/@usage:
http://www.tei-c.org/release/doc/tei-p5-doc/en/html/ref-attDef.html
where it remains meaningless, along with its shady partner "recommended when applicable".
Something is either mandatory or it's not. Similarly, it's silly to say that something is recommended when applicable; how could it be recommended when it's not applicable, and how could rwa be different from simply "recommended", which also exists?
I recommend (if applicable) removing mwa and rwa from this list.
Not sure why you've opened this as a new ticket: the older one includes a comment from Sebastian reminding you to remove usage of MWA as a value too (as well as a reminder from me about the distinction this term was trying to introduce). We already agreed to remove the distinction so I'd say this is a plain old corrigible error.
Since I wasn't the person implementing the original ticket, I wanted to make sure that I hadn't missed anything, and that this particular usage of mwa/rwa wasn't retained for a reason.
I've now removed mwa and rwa from TD, from att.transcriptional.xml, and from attDef.xml, in rev 12913. I'll keep this ticket open until the build completes successfully.
Build of rev 12913 OK, so closing the ticket.