"post" or "reject" parked Document ?

Hi All,

I am designing a WF for posting of parked invoices with BO - FIPP.

At some approval level where 'X' person will post the parked Invoice , we want to give him the option of rejecting the document as well.

If I am using tcode - FBV0 for post document , we have option for "post" but no option is provided for "reject".

Please suggest how to go about it ??

Best Regards

Priya