CRM integration with FI/CO

Hi,

I am working on CRm service management. We have service contracts for which we need to do a revenue recognition. Can any one help me with the design how should i do in FI co do i need to use internal orders for colleting cost and revenues do a revenue recognition periodical and then post to PA.

Please help me who has an integration experience with CRM service project.

thanks

shravanthi