Would like to be able to "Lock" a transaction

Great software; I am new to Stessa but very pleased at the simplicity. I would wish for the ability to “Lock” a transaction so that it can not be accidentally deleted or altered. This could be an additional column under transactions where I can place a “checkmark” in a box that locks the transaction. I would use this when I confirm a bank transaction with my bank statement, or with a utility bill paid upon presentation of an invoice. Thanks for a great program!