A cash receipt isn't reflected in the balance of your bank account
If you recorded a receipt but your account balance is unchanged, you may have entered the bank account as an allocation account by mistake. The effect of such a transaction would place money in the account, then remove it immediately, causing no change to the account's balance. It's also possible that you selected a bank or credit card account other than the one you intended, or you may have inadvertently grouped the receipt with your undeposited funds.
Locate the payment in the Bank Register window. If you've used the bank account as the allocation account, the transaction will appear in the Bank Register twice -- once as a deposit, and a second time as a withdrawal. Click the zoom arrow that appears to the left of the transaction (if it appears twice, you can click either arrow); the transaction will appear in the Receive Money window as you originally entered it. Depending upon how your preferences have been set, you can either edit the incorrect account or reverse the transaction and reenter it with the correct account. (Choosing changeable or unchangeable transactions)
If the receipt doesn't appear in the Bank Register window, it's probably been grouped with your undeposited funds. If this is correct, simply include the receipt on your next deposit. Otherwise, open the Transaction Journal window and locate the transaction. (It should appear on the Receipts tab.) Click the zoom arrow that appears to the left of the transaction; the transaction will appear in the Receive Money window as you originally entered it. Again, depending upon how your preferences have been set, you can either edit the incorrect account or reverse the transaction and reenter it with the correct account.