How to check and resolve the filter and display issue in SAP MSS Report?

We have this report in SAP MSS portal where after selecting one option from the filter, expected data is not displayed.

We call it the Training Details which is just a copy of the standard Personnel Development page in the Content Management - Content provided by SAP. The only difference is the title and other minor buttons are disabled but basically functions the same.

On the page there is a drop down Employee Selection. When you select "Direct Report", it works well. Details are displayed.

But when you select other options such as "Employees from Organizational Units" then select an item in the structure the click Go, the details section becomes blank.

This issue only occurs in our Prod environment. We cannot replicate it in our QA or DEV environment. We have already compared portal roles and SAP R/3 roles of all the affected employees for Prod and QA. We have also compared the page properties and permission in Prod and QA as well as compare this page to the standard page but still we cannot see any difference that may have triggered the issue.

Our SAP version is SAP ECC 6.0.

Hoping that somebody can give us some light on how or why this issue occurs. It will be greatly appreciated.

Thanks!

-Brenda