USEREXIT to update BSEG-BVTYP field through VF01 transaction

Hi Folks !

I have a requirement where I have to update the Partner Bank Type(BSEG-BVTYP) field through the transction VF01.

I tried with many exits like SDVFX008, RV60AFZC, RV60AFZZ and Includes like ZXVVFU01, ZXVVFU08, but unfortunately no results.

I want to know which structure is passed from SD to FI when we create a invoice in VF01.

Please help me, how could i update this field through VF01.

Thanks in advance !