Hi,
1) Create a 'Z' report. Submit RM07DOCS(mb51) with the required parameters .
2) Retrieve the final internal table from MB51 . Check the following threads- Two approaches given:
Gain Programmatic Access to Data of SAPGUI ALV Reports
3) Add the additional field in the layout, add data fetching logic for the new field and display the list in your Z report.
Regards,
DPM