Revenue Recognition with Partial amount

Hi Gurus,

I know that  we have to define Differed G/L in OB40 and maintain actual G/L VKOA. and need to Run VF44 and VF45,

But my question is if i post the invoice with amount is 100000/- and i run VF44 and VF 45, i want 10% of 1 lacs to get recognised as Revenue.

Can i write routine anywhere so that i can write this 10% revenue Recognition logic somewhere?

does Accrual Engine play any role here?

Pls Reply soon.

Reg,

Amol