When publishing the Gantt autoschedule, you get a system error if a process with the task primary object and associated parent object is active on the system

Document ID : KB000103061
Last Modified Date : 22/06/2018
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Steps to reproduce:

1. Create a process with a primary object task
2. Add a linked object being parent 
3. Add any auto-start condition on update like:
   ( ( Task ID = 'mytask' ) and ( Task Finish != Task Finish [Previous Value] ) )  
4. On the Start Step tab link it to finish and validate it.
   We just need an active process with a link between task and parent object 
5. Create a project or edit an existing one
6. Go to the tasks tab and create at least one task
7. Open the project in Gantt
8. Click on autoschedule icon
9. When prompted for publishing the tentative schedule, click on publishing

Expected result: The project autoschedule to succeed
Actual result: You get an error: "System error. Contact system administrator."  
This is caused by DE42042
This is currently being reviewed by engineering

Workaround: Set the process on draft mode