PR with Activity description table

Dear All,

I want to develop a report for each PR respective WBS element and Activity description should display.

Like

PR No.         WBS element                        Activity description.

I am able to link PR with WBS through table EBAN and EBKN. But unable to link with activity description.

I am into MM and very less knowledge into PS. So please help me how to achieve this requirement.

Regards

PR