We are trying to develop a Decisions approval process, which will send the Decision Approval / Rejected notification to the Approvers and Owners. The issue is that even though we succeed in sending the notification, the details in the notification email does not have Investment Data like ID or Name (Project) available to add to the email header.
How could we include parent investment name in the email notification?
You should create a virtual attribute on the subobject selecting Name from parent.
This virtual attribute can be used in the email notification to display parent name.