Change Documnet FBV2 issue in rol back

Hello Experts,

can you all guide me how to roll back/revert back the changes done to the parked document , as am new to FI concepts as an abaper .

We are calling FBV2 through BDC call transaction and business says once document change is done , they want to revert back the document to its original as it was .

Thanks ,

Praveen .