Allow Parallel Execution Doubt

Hi All,

I have few doubts when i tried Dynamic Referenced process in BPM .

  1. My parent process is in waiting state if i mention the return documents name to be fetched from the child process in the sub process model documentlist . Can anyone help me in solivng this issue and

Also ,Can anyone please explain me breifly on how the allow parallel execution works and also please tell me a scenario to test the functionality.

Thanks and Regards,
Sathyaraj Balaraman