There was an error processing type ‘{0}’. Type member ‘{1}’ declared in ‘{2}’ is missing required ‘{3}’ property. If one class in the class hierarchy uses explicit sequencing feature ({3}), then its base class and all derived classes have to do the same.

This was due to having Order on some but not all DataMembers of the data contract (might have been more helpful if the error had actually contained values for the format parameters).

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