When I try to create new history line programatically, i can change Subject field and others. But when I try to change System field RuntimeException throws with following message: Program error: the attribute 'system.' of this history line service call cannot be modified, because the history line service call item was opened in view mode or because the attribute is read-only. I use administrator's login. My question is: how can I create new History line with system filed set to TRUE?
I use following source code for creating new HistoryLine: