Section 69A of the Employment Act quoted below may be helpful:
"69A. Notwithstanding section 69, the Director General shall not inquire into, hear, decide or make any order in respect of any claim, dispute or purported dispute which, in accordance with the Industrial Relations Act 1967—
(a) is pending in any inquiry or proceedings under that Act;
(b) has been decided upon by the Minister under subsection 20(3) of that Act; or
(c) has been referred to, or is pending in any proceedings before, the Industrial Court. "
You can contact the Labour Department for further clarification, if necessary.