user Exit while doing clearing in F-32

Hi All,

Is anyone aware of any user exist for the customer clearing in transaction F-32. We would like to capture the original document being cleared in F-32.

Then based on a specific GL account in the original document, we want to substitute a different GL account each time in the clearing document that is/will be posted during F-32.

Where does the system store the document numbers being cleard in F-32 . We want to write a user exit to replace the GL for the cash discount in the clearing document being posted ( payment document ). The system allows only one cash discount account in OBXI.

But while doing payment, we want to hit to a different GL accounte each time based on the GL in the original accounting document.

Can anyone suggest..

thanks,

kris..