To Open Desired schema through Bentley Class Editor..
When opening OpenPlant_3D.01.07. ecschema (SS6) software shows missing reference as Integratedstructuralmodel.04.00. ecschema & Designsync.01.01. ecschema.
The OpenPlant_3D ecschema contains the data model properties and is referenced by all OpenPlant Modeler schema
If above problem still persist, then please create a Service Request and contact Bentley Product Advantage group along with the list of all relevant details to get in depth analysis and for possible solution or workarounds.
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