On Request Line Approval Task Script
These scripts are assigned to Workflow Review or Approve tasks and are executed when the user approves a line or mass approves lines in a Request.
This event is useful especially to validate properties or actions taken in a request before it gets approved by the Reviewer or Approver.
These scripts are associated in the Workflow -> Tasks -> Reviewer/Approver type tasks

*Figure: On Request Line Approval Task Script Association