Why can't I see cart details for punchout lines in my requisition?

In the Edit Requisition page, Requisition Lines region, the View Punchout Cart selection in Actions is unavailable if:

• You aren't assigned the View Requisition Diagnostics privilege.

• The requisition is an active requisition.

• No punchout line was added to the requisition during your current active user session.

• You have navigated to other tasks, other than adding local catalog items to the requisition.