Subprocess multiple instance error BpmException: Multiple actors found for procRole


I am a newbie to bpm. I am asked to create a process model with subprocess. Multiple process actors of the same procRole are assigned before the sub process but failed with the error BpmException. Can I set multiple-instance type of the subprocess to parallel? Do I need to set the multiple-instance type of first user task of subprocess to parallel? Thanks in advance

do you need a process like this one?