What actually happens in the bank
You deposit a customer cheque for AED 42,000. The bank credits it, often provisionally, and a few days later returns it unpaid with a reason, usually insufficient funds, a signature mismatch or a stopped payment. The bank statement then shows the original credit, a debit for the returned cheque, and usually a separate returned-cheque fee.
If you recorded the receipt when you deposited the cheque, your books now show a paid invoice and more cash than the bank holds. That is why the return must be posted the day you learn of it, not at month-end reconciliation.