QuickBooks/QBXML/Object/NonInventoryItem.php
public function isSalesAndPurchase($enable = null)
	{
		$current = $this->_is_sales_and_purchase;
		
		if (!is_null($enable))
		{
			$this->_is_sales_and_purchase = (boolean) $enable;
		}
		
		return $current;
	}
public function isSalesAndPurchase($enable = null)
	{
		$current = $this->_is_sales_and_purchase;
		
		if (!is_null($enable))
		{
			$this->_is_sales_and_purchase = (boolean) $enable;
		}
		
		return $current;
	}
Tell (and optionally set) whether or not this item is currently for Sale *and* Purchase

@param boolean $enable
@return boolean