Can we apply prepayments in AR related to the Contracts

We receive a prepaid amount of the contract upfront. As we perform the services, we would like to get the billing events in the Contracts module to be transferred to the AR module in order for that to be applied automatically as AR invoices are generated later on, until prepayment is exhausted. That upfront payments should show up on the AR invoices as well."

I've followed the steps below,

1. Created Automatch Rule set
2. Created Autocash Rule Set
3. Assigned these rules at Customer site level
4. Created a receipt through Lockbox and also Created a receipt using Spreadsheet
5. Created multiple AR Transactions