Cost Amortization

We have a service contract with the customer.  Revenue associated with that contract is getting Amortized every month and the billing in Advance.

There is a cost we paid to some vendor in order to acquire that contract.  We also need to pay monthly to another vendor in order to provide that service.

Our accounting team want to Amortize this cost along with the Revenue.  How do we use Service contracts module to amortize this cost?