ORIGARTIST (TOPE) not read by MinimServer

[Mangar]

Hello,

MinimServer is really a UPnP Server that makes everything possible I can dream of. But one thing I don't get to work:

I want a Control Point at the Top Level with name "Cover Versions". So I added an indexTag "OrigArtist:Cover Versions". I expected to see only Songs inside that have the tag ORIGARTIST set. And I set this tag only if it's cover version. But it didn't work.

In the tag mappings list I can't find the TOPE frame. So I wrote all Tags by the writeAllTags property and inside that generated file isn't either the tag ORIGARTIST nor the value that I saved inside that tag. Other custom tags are recognized, but not the TOPE frame.

Hope you can help me.