Which of the following is NOT expressly dealt with under Section 45 of the Industrial Relations Code,…

Filling of vacancies is dealt with under section 44(9), not Section 45, of the Industrial Relations Code, 2020; section 45 (formerly section 9 of the Industrial Disputes Act, 1947) protects notifications appointing members of a Tribunal, and acts or proceedings before it, from challenge on the ground mainly of a vacancy in, or defect in the constitution of, the Tribunal.