Hi Orianne,
The Open Payables report is based on a temporary work file, rather than directly from the accounting data, to improve speed. It may be that if there are no outstanding invoices or other transactions selected for this report, no work file is created, and thus the report does not print.
There is an option on this report to print 'zero balance vendors'. Does this allow printing the report for you?
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Regards,
Softrak Tech Support