Symptoms

Customer has a process with 2 parallel lines from Start workflow. The first activity for each line has an event that will update same process data filed with different values. Then the next event for each line will be IPC event passing the same data field to another process. When running, it appears that the IPC process will use the same value for the data field getting passed by the parent process even though the data field is set to different value for each line.
 

Diagnoses

With this specific scenario, the recommendation would be to use Activity Data Field instead since we cannot guarantee that the IPC event from the first line would be executed before the data event from the second line.
 

Resolution

Customer was able to use Activity Data Field to resolve the issue.