Case C-625/20: Judgment of the Court (Second Chamber) of 30 June 2022 (request for a preliminary ruling from the Juzgado de lo Social No 26 de Barcelona — Spain) — KM v Instituto Nacional de la Seguridad Social (INSS) (Reference for a preliminary ruling — Social policy — Equal treatment for men and women in matters of social security — Directive 79/7/EEC — Article 4(1) — Indirect discrimination on ground of sex — National legislation providing that two or more total occupational invalidity pensions acquired under the same statutory social security scheme are incompatible — Compatibility of such pensions where they come under different statutory social security schemes — Finding of indirect discrimination on the basis of statistical data — Determination of the affected groups to be compared — Justification)