Change parked document with the help of BAPI

Hi All,

I am creating a new process where in, i start with parking a JV type document via portal. I used a BAPI for parking the document and it worked

I am not able to find a BAPI to change the parked document via portal.

I tried using the below BAPI's for chaning the parked document, but it did not work out.

1. PRELIMINARY_POSTING_UPDATE

2. PRELIMINARY_POSTING_UPDATE_ENJ

Any help highly appreciated.

Best Regards,

Raj