Questions Editing Expense Claims

We are configuring Acumatica and want to use the Expense Claim feature.  We need employees to be able to submit expense claims, but have our accounting department review and approve.  That is no issue.  We have 2 employees in our AP department setup in a workgroup and as approvers for expense claims.  The expense claims go to them for approval, but they can't open/review/edit the expense claim.  They can only see approval row with the fields, but can't see any of the individuals receipts on that claim.

Do we need to set them up to approve expense receipts instead of expense claims?  

For Purchase Requests, the approver can see all the details of the purchase request.  It is not clear to me why this is different for expense claims.  Any insights would be appreciated.