I have created this issue as proposed by luowy and Ivan.
For the issue see https://redmine.blackboxframework.org/issues/210
For the original discussion see https://forum.blackboxframework.org/viewtopic.php?f=40&t=755
The changes so far are in https://redmine.blackboxframework.org/projects/blackbox/repository/diff?utf8=%E2%9C%93&rev=17a6b29eff65a56f3681e7ef1daa187e82d615fe&rev_to=e952a39ba0ab7d9dc61b2789de3fc19e59a688be
The docu is not yet updated.
- Josef