Sample customization code for the validation writer can be found on Smart Community. For more information, see Find sample data on Smart Community.
Ensure that all referenced assemblies are in place before starting the customization. The Intergraph.VTL.Server.dll is a mandatory assembly for the custom validation writer, as it contains the interface that has to be implemented to customize the report writer. This assembly is found in the following location:
<drive>:\Program Files (x86)\SmartPlant\Foundation\SPFServer\bin