Function module to 'Simulate' parking document in FI

Hi Experts,

I have one custom program which will create Parking document using 'PRELIMINARY_POSTING_FB01' FM. This is working fine but I need to give an option to 'Simulate' the Parking document without creating the Parking document. I could not find any FM to do this, Please let me know if there is one.

Regards,

Dileep.