Customer Balance Covnersion

How do we do conversion of customer deposits. In the functional spec what document type we need to provide to bring in the deposits. I dont see any document type for down payment. Do we use transaction code F-29 in place of F-22 or FB01 to bring in deposits from legacy to sap. In this case can we use the same offsett account for customer balance conversion that we are using for customer open invoices??

Thanks

Lakshmi