Assume you have to pay a vendor giving a cheque. You give the cheque to the customer on 8th Jan and date mentioned in the cheque is 10th Jan and you are recording it in the application on 9th Jan.
Once issued, the vendor account will be debited. You can click to see the transactions created.
When you are settling the bank statement on 11th Jan or later, go to Bank's account detail and click on Due Cheque to settle .
Assume the cheque was submitted on 13th and money got deducted from the account on 13th Jan, select the transaction date as 13th Jan and submit.
Once submitted, amount will be reduced from the Banks GL.