Because you don't intend to log the check number into Payables, but just want to give your supplier your banking information, you could print a check using the 'Blank Check Stock' function from the Reports menu. This would print to your check stock as usual but without any amounts filled in. You would then have to write VOID on the check.
You may want to first edit your check spec and have a label that prints VOID (instead of handwriting) and save this as a new specification to use for the blank check stock. And maybe even remove other field information if desired.
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Regards,
Softrak Tech Support