unable to invoke referenced process in 8.x

I have upgraded 7.x process models to 8.2 SP2. When I try to trigger the process, the parent process is getting triggered but referenced process is not getting invoked. No errors are seen in the IS logs.

Please note that when we migrated the process models we were not able to build and upload, so we have changed the referenced process step to refer to the new Process ID. This was done because when we imported the process model into 8.x designer the Process ID was changed(previously it was pq_Processproject/processName_xddfi which is changed to just ProcessProject/ProcessName).

Please let me know if any other details are required.

Thanks in Advance,