Hi there, @tanaka-spencer. 

Thanks for taking the time to follow along with the thread. I'm happy to clarify what my colleague means by "if the check was included in your previous reconciliation". 

My colleague means that if the check has been reconciled in a previous reconciliation, you'll need to undo it, so that it can be deleted. I've included some steps to unreconcile the check below. 

1. Click Accounting, then go to Chart of Accounts.
2. Choose the bank account, then click View register.
3. Look for the transaction.
4. In the reconcile status column, choose the top line repeatedly to change the status (C - Cleared, R - Reconciled, and Blank - Not cleared or reconciled).
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For additional details about this process, check out How to unreconcile a transaction or undo a reconciliation.

Please let me know if you have any further questions or concerns. I'm always around to lend a hand. Take care!