Some transactions can't be changed

Regardless of your security preference setting, there are some types of transactions that can't be changed. They are customer payments*, paychecks, refund checks and bank deposits of undeposited funds. Also, payments that have been authorized using the MYOB Merchant Account Service can't be changed; they can only be voided or reversed.

To remove the effects of these transactions from your company file, you can either delete them or reverse them. (Deleting transactions and Reversing transactions)

*An exception: Information in the Applied Payment Details window can be changed. If a Business Services payment has been authorized, the information can't be changed. (To change applied payment details)

If you've upgraded your company file from an MYOB product earlier than version 3, item invoices and purchases that were recorded in the earlier version and contain inventory items can't be changed; they can only be reversed.

Also, inventory transactions recorded using MYOB software previous to version 3 can't be changed, reversed or deleted. (Managing inventory transactions recorded in MYOB software previous to v3)