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** This issue is addressed in ArcSDE 9.0 Service Pack 2 (SP2) **
The name of the DHDN coordinate system was taken from EPSG (European Petroleum Survey Group). Originally, this was spelled as GCS_Deutsche_Hauptdreiecksnetz. At a later release, EPSG fixed the spelling to GCS_Deutsches_Hauptdreiecksnetz. German clients have problems with this spelling change, because when attempting to do a datum transformation on data with the old coordsys name, the transformation searches for the new name, not the old, so no match is found.