Came across this problem last week. My client attempted to pay off some outstanding invoices from his bank feed, he discovered he couldn't as the unpaid invoices had been created in a previous VAT quarter that I had locked after filing. Reckon one considers the payment as a change and will not let it happen without unlocking the account. My client unlocked it then trashed his way across the company file, entering a multitude of receipts thinking he was doing me a favour. He didn't realise that Reckon One wasn't capable of logging any changes from the filed quarter, it just adds them on to the previous period instead of pulling them forward to the current quarter to be filed.