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Thanks! Yes, I realized after a while that the current name is Aulagromyza and that I have the most recent key I guess in Agromyzidae of Hungary, vol. 2.
With some confidence I think I'm able to say that the species most be Aulagromyza lucens - or something very similar. The picture I've made shows the distiphallus and hypophallus in anterior view and lucens comes closest.

Perhaps Milos would like to comment on this ... ?