POWL Expenses for Approval buttons not working

Dear Gurus,

We are on latest SPs (EA-HR 607 SP21, SAP_HR 604 SP70, EP 7.31 SP10).

I've configured POWL query Expense Reports for Approval (ID: FITV_POWL_TRIPSFORAPPROVAL_EXP) on to the application MANAGER_MSS_INBOX_2. All the personalization related to Employee list for expenses are in place. The class behind the above query is CL_FITV_POWL_TRIPS_TOBEAPPROVE. Workitems are populating perfectly and the preview of the Expense claim also displays on the POWL.

But,

Issue: When a manager access the workitem under Expense Reports for Approval, buttons 'Display/Print', 'Maintain Employee List' and etc enabled. When a manager click on Display/Print or Maintain Employee List, nothing happens. Also the same when click on Attachments link.

Please see below screen shot.

I believe it is a bug introduced in the latest SPs. Could someone help in this as soon as possible, please?

Many thanks for your time and help in advance.

Regards

SP