QbXML for Adding a Purchase Order
<?xml version="1.0" encoding="utf-8"?>
<?qbxml version="7.0"?>
<QBXML>
<QBXMLMsgsRq onError="stopOnError">
<PurchaseOrderAddRq>
<PurchaseOrderAdd>
<VendorRef>
<FullName>Test Vendor</FullName>
</VendorRef>
<TxnDate>2013-01-02</TxnDate>
<RefNumber>3434</RefNumber>
<PurchaseOrderLineAdd>
<ItemRef>
<FullName>My Item Name</FullName>
</ItemRef>
<Desc>Test description.</Desc>
<Quantity>5</Quantity>
<Rate>29.95</Rate>
</PurchaseOrderLineAdd>
</PurchaseOrderAdd>
</PurchaseOrderAddRq>
</QBXMLMsgsRq>
</QBXML>