QbXML for Deleting "Transaction" Objects (Invoices, Journal Entries, etc.)
Example qbXML Request
<?xml version="1.0" encoding="utf-8"?>
<?qbxml version="11.0"?>
<QBXML>
<QBXMLMsgsRq onError="stopOnError">
<TxnDelRq>
<!-- TxnDelType may have one of the following values: ARRefundCreditCard, Bill, BillPaymentCheck, BillPaymentCreditCard, BuildAssembly, Charge, Check, CreditCardCharge, CreditCardCredit, CreditMemo, Deposit, Estimate, InventoryAdjustment, Invoice, ItemReceipt, JournalEntry, PayrollLiabilityAdjustment [PRIVATE], PayrollPriorPayment [PRIVATE], PayrollYearToDateAdjustment [PRIVATE], PurchaseOrder, ReceivePayment, SalesOrder, SalesReceipt, SalesTaxPaymentCheck, TimeTracking, TransferInventory, VehicleMileage, VendorCredit -->
<TxnDelType>Invoice</TxnDelType> <!-- required -->
<TxnID>ABCD-1234</TxnID> <!-- required -->
</TxnDelRq>
</QBXMLMsgsRq>
</QBXML>