setting transactionbilladdress for SalesOrders in PHP

would anyone happen to know how to add a SalesOrder with the transactionShipAddress and transactionBillAddress fields set to what I specify ?

I can't seem to get this to work, this is my code :

$orderData = array();
$orderData['billAddressee'] = 'Some Guy';
$orderData['billPhone'] = '6665554321';
$orderData['billAddr1'] = '101 Some Sreet';  
$orderData['billAddr2'] = 'Suite 101';   
$orderData['billCity'] = 'Nowheresville';
$orderData['billState'] = 'OR';
$orderData['billZip'] = '97214';
$orderData['billCountry']  = '_unitedStates';
// A bunch more data set here ...
...

// set up addresses (transaction bill address and shipping bill address will be set to the same for now)
$shipAddress = new nsComplexObject("ShipAddress");
$shipAddress->setFields(array('shipAddressee' => $orderData['billAddressee'],