Thanks for the reply. I'm using the 10.2.7 release. I already found out that the default transformation of the spatial reference we are using (DHDN) is NTv2, which is a grid based transformation. But I think it is hard wired in the Runtime dll because I cannot find any reference of the datum grid file "Beta2007.gsb" in any of these files. Nevertheless it might be possible to change the default transformation by changing the gcs.override.csv or pcs.override.csv file. But I have no idea how to accomplish this. How will custom transformations be implemented in the 100.2 release? Will there be an overload of the project method of the GeometryEngine like in the Java SDK?
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