Hi Kay,
Adagio Invoices won't be able to do what you outlined easily (if at all).
You could post the payment in AR with a 'to-be-determined' invoice number (a 'UP' detail type), and then later on post the first Adagio Invoice with the same document number. This would automatically match up to the AR credit. However this would work for only the first invoice as AR won't allow duplicate invoice numbers.
You could post the pre-payment in AR as several payments, one per month, each with an unapplied payment detail and an invoice number. Then each month use that invoice # in Adagio Invoices to match up to the particular pre-payment. The major draw-back here is that you have to get the right invoice number and that likely would be quite time consuming. Technically possible but not so efficient...
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Regards,
Softrak Tech Support