Hi Susan,
The message had to do with the 'Print / Post checks and advices' function, that had an outstanding pre-check register that was not yet posted. There is some conversion that has to be done to the file generated by the pre-check register, thus it has to be cleared by the AP81B conversion process.
Afterwards, all you have to do is re-print the pre-check register report to get that file back with the list of outstanding invoices to pay.
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Regards,
Softrak Tech Support