BPM Task in UWL - From Field always empty, why?

Hi Experts,

do you know if it is possible to set the field "From" of a Task from BPM in the UWL?

It seems that for every task the standard field "From" is always empty and I have not found any documentation about how it would be possible to set a user here (if possible) or a clear statement that this is not used by SAP NetWeaver BPM.

Does anybody know if this field could be set from a Task (that would be great)?

Or does anybody knows a clear statement that this is not used in BPM Tasks (not so good but would clarify a lot)?

Thanks and best regards,

Stefan Brauneis