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Thank you for posting here in the Community, diane.
I can help you in editing the check number of your invoice.
Yes, you can edit the check number of the invoice that you've created. On the Invoices tab, there's a drop-down menu below the Actions tab where you can View/Edit it.
You may check the following articles for more information:
That should update the check number of the invoice. If you have any other questions or would like me to clarify anything else, let me know. I am always glad to help in any way I can. Have a good day.