(c) Limitation.—
(1) An order may not be issued under subsection (a), and if so issued shall have no force or effect, against a judgment debtor with respect to whom there is in effect a writ of garnishment of earnings issued under this chapter and based on the same debt.
(2) An order may not be issued under subsection (a) with respect to any earnings of the debtor except nonexempt disposable earnings.