How to start a call activity?

[group_it]

this is process

only set called elment:

when it com to the task of “销售上载新版数据”，it throw a Exception when complete task:

Unknown property used in expression: #{prm.getSingleTaskAssignee(bpmProcInstanceId, “role”)}

the call activity can’t start
and where can i invoke startProcess() to set start data

[gorbunkov (Maxim Gorbunkov)]

Answered here: How to use Submodels in BPM? - #3 от пользователя gorbunkov - CUBA.Platform