Hello Tim,
To find Handler class for Genil object we use 'GENIL_MODEL_BROWSER' or 'GENIL_MODEL_EDITOR' for 7.0 EHP1 ot higher. Navigate to GenIL object, you can find handler class
we don't have handler class for Builheader as it is not required to maintain BuilHeader separately.
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Tim, But seems I am afraid, that I am mis-leading you, handler class is not GenIL Object class, but GenIL object can be handled by using them.
Please feel free to ask question.
Regards,
Devender