I'm a volunteer rather than an accounting pro, so sometimes QuickBooks is a bit beyond me. 

My organization sent an invoice in July, received payment as a check a few days later, and I deposited that check along with several others in the bank on 7/26.

I then classified that transaction under "Banking", splitting it, with the amount of the check going to the correct category.

Then I remembered I needed to mark the invoice as paid, so I did.

Now the amount is double-counted in the category on our P&L report, once as a bank deposit and once as a paid invoice.

How do I convince QuickBooks that (part of the) bank deposit is the same thing as the paid invoice?