QuickBooks/QBXML/Object/Customer.php
public function setParentApplicationID($id)
	{
		return $this->set('ParentRef ' . QUICKBOOKS_API_APPLICATIONID, $this->encodeApplicationID(QUICKBOOKS_OBJECT_CUSTOMER, QUICKBOOKS_LISTID, $id));
	}
public function setParentApplicationID($id)
	{
		return $this->set('ParentRef ' . QUICKBOOKS_API_APPLICATIONID, $this->encodeApplicationID(QUICKBOOKS_OBJECT_CUSTOMER, QUICKBOOKS_LISTID, $id));
	}
Set the application id of the parent client

@param string $id
@return boolean