Trigger Task Status change upon Incident Submit

Summary

How do I change the status of a task, once an incident is submitted?

Content

Hello,

I have created a relationship between the task table (parent) and incident table (child)  This allows OPA to assign an existing task as a parent to the incident.  This is necessary because OPA won't map out to the task table and the incident table at the same time.

The task is created by a customer contact, and I use the task ID as the object ID in the Contact Checkpoint table.  When the contact creates the task, it is set to "in progress" because it denotes an OPA interview that has been started but not submitted yet.  After the interview is submitted and creates the incident with the Task ID populated, thereby linking the incident to the task, I need to set the status of the task to "Completed", however, I don't see a way to trigger the business rules to do this.