Funds Mangement - Price Difference to be updated in FM

Hello -

I am creating a PO for material at $500 per unit. The same material is priced at 475 $ (moving ave price) in material master. Goods receipt will happen at $475 and a Price difference of $ 25 is posted in FI. Would system update both $475 and $25 in FM , in my case it is not happening , what should i do to have Price difference updated to the same commitment item at the time of good receipt?.

Thanks

Chris