Prepayment adjustment

hello

We have a couple of suppliers accounts where Prepayments  were not applied to the invoices but the trial  balance amount as on date is zero.  This invoices and prepayments are of previous years. We are not doing any transaction with these suppliers now.. Prepayments Status Report is showing long list of standard Invoices, prepayments  and credit memos. Applying payments to invoices is very long process. Is there any other alternative.

Thanks

Gobind Ahuja