You asked How do I match a transaction which is not identified by the system? But I know the transaction which is already posted manually upon issue of cheque.

Hi there, @grishsavla.

There are scenarios when the system doesn't recognize a match. These are:

• The transaction is older than 180 days
• The dollar amount in QuickBooks is different than what cleared the bank.
• The transaction type is different in QuickBooks than at the bank. QuickBooks wants to match a check with a check and an expense with an ACH or debit/credit card swipe.
• The transaction was recorded in a different bank account (see Tip #4)
• The transaction from the bank is a payment/ deposit of two or more open transactions in QuickBooks.

Thus, you can use the Find match tool, to manually match the transaction. From there, it will show suggested matches that might match data. 

You can see this article to know how to review bank and credit card transactions after you download them into the system: Categorise and match online bank transactions in QuickBooks Online.

For future reference, you may find these resources helpful:

• Unmatch or move bank transactions after reviewing them
• What to do if you see a bank error or bank transactions won’t download

If you have follow-up questions in managing your transactions, let me know by commenting below. I'm always here to answer it for you. Take care.