Auto entry came in QB which debited to "Checking" account & credited to "Opening balance equity" account.We never created these accounts in QB. These are auto created

I am here to give you information on how keep your financial records accurate, @Amit.telgade.

Once your bank and credit accounts have been connected to the QuickBooks Online (QBO), it’ll then download historical transactions for a period of time, totals and enters the opening balance and date for you. The opening balance amount will reflect on the Opening Balance Equity account as a credit. This is a default account generated by QBO.

If the amount is incorrect, you can change it by following the steps in the Edit an opening balance section from this article: Enter and manage opening balances in QuickBooks Online.

However, if you haven’t connected your checking account with QBO Banking, I suggest checking the Audit Log to see who has created the transaction in the checking account register. You can see who made changes to your books and what they did.

Tracking new transactions in QuickBooks online comes after opening the balance date. If you missed opening an opening balance and have already been tracking your transactions, here’s how to enter an opening balance in QuickBooks online afterwards. 

Keep me posted if you have additional questions. I’ll be happy to help. Have a great day ahead!