/**
* adding a item onto the purchase order
*
* @param Product $product
* @param double $unitPrice
* @param int $qty
* @param string $supplierItemCode
* @param string $description
* @param double $totalPrice
* @param mixed $newItem The new PurhcaseOrderItem
*
* @return PurchaseOrder
*/
public function addItem(Product $product, $unitPrice = '0.0000', $qty = 1, $supplierItemCode = '', $description = '', $totalPrice = null, &$newItem = null)
{
$newItem = PurchaseOrderItem::create($this, $product, $unitPrice, $qty, $supplierItemCode, $description, $totalPrice);
return $this;
}
