29With regard to equivalent professional experience, it must be noted that German migrant workers, including those from the Land of Lower Saxony, who intend to perform for more than three years the duties of a school teacher or equivalent duties with one or more schools or comparable establishments outside that Land or in a Member State other than the Federal Republic of Germany will be dissuaded from so doing. Thus, those workers will in particular be dissuaded from leaving their Member State of origin to enter the territory of another Member State in order to perform the duties of a school teacher or equivalent duties if, following their return in the territory of the Land of Lower Saxony, despite having performed, in essence, the same work in that other Member State, their equivalent professional experience is not taken into account in full when the Land of Lower Saxony determines their salary grading (see, to that effect, judgments of 30 September 2003, Köbler, C‑224/01, EU:C:2003:513, paragraph 74, and of 10 October 2019, Krah, C‑703/17, EU:C:2019:850, paragraph 47).
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