The Public Service Association has filed a claim with the Employment Relations Authority to stop the Government restricting flexible workplace practices.
The PSA has argued the new directives on working from home violate its existing agreement with the Government.
Fleur Fitzsimons, the acting National Secretary of the PSA, says the Government has failed to take the Gender Pay Principles into account.
"One of them is that agencies normalise flexible and part-time working arrangements for all employees. So our concern, really, is that the recent Government directive has failed to take into account the commitments under the Gender Pay Principles."
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