Hi Jennifer,
This is really a Technical Support question, so I'm going to move your thread into that Forum.
"Voiding" a check is bad. "Reversing" a check is good. I expect the person Voided rather than Reversed the check. There is an option in the Company profile to prevent people from Voiding a Check.
Reversing a check debits the Bank and re-instates any invoices the payment was applied to.
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Andrew Bates