Hi, Cam,
No there isn't. BankRec allows duplicate cheque #s so allows them to be entered. The Company Profile option is to 'warn' of them only which it does when the batch is posted.
I can enter a request to R&D that, if this option is turned on in the Company Profile, BR warns a user that enters a duplicate cheque number when they close the entry.
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Regards,
Softrak Tech Support