Lock down is the final action for a month, to be completed when all the transactions in the month have been analysed and saved.

When you lock down the month, have the original bank statements to hand (either online on in paper form), because you will be asked to confirm that the balance at the end of the month matches the balance on the original bank statement.

If the balances agree, you will have confirmation that all the transactions on the bank statement are also on My Bookkeeping Online.

You can reverse a lock down at any time, if you want to reanalyse a transaction.