How to iterate a users group?

Hi, the question says it all. The possibility to iterate users group is announced everywhere for the new YouTrack version, but I can't find any documentation regarding this. I've found some issues (like http://youtrack.jetbrains.net/issue/JT-11811) but in all of them there needs to be a field attached to issue to iterate a group assigned to this field. Also the automatic completition doesn't work when assigning to var workflow variable. Is it true that there needs to be some artificial field assigned to issue to iterate a users group?

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Original message URL: http://devnet.jetbrains.net/message/5447974#5447974