What it does
The Federal Courts (State Jurisdiction) Act 1999 (SA) is remedial legislation enacted to overcome the legal consequences of the invalid conferral of state jurisdiction on federal courts. It operates by statutory fiat to declare that certain "ineffective judgments" of the Federal Court of Australia or the Family Court of Australia are to be treated as though they had always been valid judgments of the Supreme Court of South Australia.
At its core, s 6 declares the rights and liabilities of all persons to be, and always to have been, the same as if each ineffective judgment had been a valid judgment of the Supreme Court. The distinction drawn in s 6(a) and (b) is important: an ineffective judgment given by a single judge of the Federal Court or the General Division of the Family Court is deemed a judgment of the Supreme Court constituted by a single Judge, while a Full Court judgment is deemed a judgment of the Court of Appeal (as amended by the Supreme Court (Court of Appeal) Amendment Act 2019 (SA) with effect from 1 January 2021).
Section 4 defines an "ineffective judgment" narrowly. It captures any judgment, decree, order (final or interlocutory) or sentence given or recorded by a federal court in a "State matter" before the commencement of the section, where the court purported to exercise jurisdiction conferred (or purportedly conferred) by a "relevant State Act". "State matter" is itself a carefully drafted composite definition in s 3 encompassing four categories: matters within the Supreme Court's ordinary jurisdiction, matters removed under the Jurisdiction of Courts (Cross-vesting) Act 1987 (SA), matters where a relevant State Act purported to confer jurisdiction on a federal court, and matters arising under applied administrative laws.
The Act then spells out the practical consequences of this deeming. Section 7 provides that the declared rights and liabilities are exercisable and enforceable, and are taken always to have been exercisable and enforceable, as if they were Supreme Court rights and liabilities. Subsection 7(2) expressly preserves appeal rights, and s 7(3) deems non-Full Court ineffective judgments to be single-judge Supreme Court judgments for appeal purposes.