Approval Heirarchy on Requisitions not visible after Submission

Summary: Approval Hierarchy on Requisitions is not visible after Submission.

Content (please ensure you mask any confidential information): While creating a requisition we are able to see the Approval hierarchy in Manage Approvals but after submitting it, when we click on the pending approval link on the Requisition, it shows the message: ' Action Details aren't available because the approval hierarchy is being prepared. try again later.' It shows the same message and the approval hierarchy never shows up even after a long time.

In the transaction Console, the Requisition shows up under In progress and in BPM worklist when we search the particular requisition, it doesn't show.