Sales and Purchases
You can only delete a sale or purchase that doesn't have a payment applied to it. If you've recorded a customer payment for a sale or a vendor payment for a purchase, you must first delete the payment before you can delete the sale/purchase.
Also, if you applied a customer credit to a sale, the customer credit must be deleted before you can delete the sale. In the same manner, if you applied a vendor debit to a purchase, the vendor debit must be deleted before you can delete the purchase.
Information for upgraders: If you've upgraded your company file from an MYOB product previous to version3, item invoices and purchases recorded in the previous version which contain inventory items can't be deleted; they can only be reversed.
Receipts grouped in the Undeposited Funds account
If you want to delete an individual receipt that was included in a bank deposit transaction, you must first delete the bank deposit. When you delete a bank deposit transaction, all receipts included in the bank deposit are returned to the Prepare a Bank Deposit window. You can then delete the receipt from the Prepare a Bank Deposit window.
Reconciled transactions
Keep in mind that if you delete a reconciled transaction, your bank reconciliation will be out of balance.
Authorized transactions
Credit card payment transactions that have been authorized using the MYOB Merchant Account Service can only be reversed or voided.
If an authorized transaction is voided, the transaction is automatically deleted as part of the voiding process. (Voiding credit card payments)