Help with exporting "Work" tag

I use iTunes as my music player (on Windows). iTunes has a “Work” tag that I populate. When I import my music library into mp3tag, things mostly work. The tag shows up in the main display and I can filter on it.

However when I try to export the data the “Work” tag does not show up. The output of the export does have a Work column, but it is always blank. Here is my export configuration:

$filename(txt,utf-16)Title$char(9)Artist$char(9)Album$char(9)Track$char(9)Year$char(9)Work$char(9)BPM
$loop(%\_filename_ext%)%title%$char(9)%artist%$char(9)%album%$char(9)%track%$char(9)%year%$char(9)%work%$char(9)%bpm%
$loopend()

Another odd thing is that I cannot add the Work tag to the Tag Panel. I don’t really care about the Tag Panel, but it may be a hint to solving this.

I hope someone can help.

Can you check the extended tag dialog at View → Extended Tags... AltT for the field name?

The WORK field is only available for MP4 tags. For ID3v2, what is filled in the Work Title in iTunes is currently displayed as field CONTENTGROUP in Mp3tag. The developers at Apple decided to reuse this ID3v2 field which was previously used to store what is filled in Grouping.

That worked like a charm. Thank you very much Florian.