Hi Carole,
The same method (ie a dummy non-printed check but for 0.00 instead of 0.01) must be applied to all the pre-payments and the invoices that net to 0.00.
Similarly, if the prepayment was posted with a non-bank invoice number and later on the invoice is posted with that same value, the invoice will automatically be matched to the pre-payment, without having to create a dummy check.
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Regards,
Softrak Tech Support