Working with DWG underlay

[AlexFielder]

Hi all,

We have a customer project that we would like to use DWG underlay for. From our initial investigations however using an iLogic-friendly version of this VBA sample:

Inventor 2022 Help | ImportedDWGComponent Creation | Autodesk

    Dim oDoc As PartDocument
    oDoc = ThisDoc.Document
    
    Dim oCompDef As PartComponentDefinition
    oCompDef = oDoc.ComponentDefinition
    
    Dim oRefComponents As ReferenceComponents
    oRefComponents = oCompDef.ReferenceComponents
    
    ' Create a ImportedComponentDefinition based on an AutoCAD file.    Dim oImportedCompDef As ImportedComponentDefinition
    oImportedCompDef = oRefComponents.ImportedComponents.CreateDefinition("C:\path\to\our\drawing\filename.dwg")
    
    Dim oImportedDWGDef As ImportedDWGComponentDefinition
    
    If oImportedCompDef.Type = kImportedDWGComponentDefinitionObject Then
        oImportedDWGDef = oImportedCompDef
    Else
        Return
    End If
    
    Dim oMatrix As Matrix
    oMatrix = ThisApplication.TransientGeometry.CreateMatrix
    oMatrix.SetTranslation(ThisApplication.TransientGeometry.CreateVector(0, 0, 10))
    
    oImportedDWGDef.Transformation = oMatrix
    
    ' Create the ImportedComponent
    Dim oImportedComponent As ImportedComponent
    oImportedComponent = oRefComponents.ImportedComponents.Add(oImportedDWGDef)
    
    Dim oImportedDWGComponent As ImportedDWGComponent
    
    If oImportedComponent.Type = kImportedDWGComponentObject Then
        oImportedDWGComponent = oImportedComponent
        
        Dim oSk As PlanarSketch
        oSk = oCompDef.Sketches.Add(oCompDef.WorkPlanes(3))
        
        ' Get the DWGBlockDefinition for model space.        
		Dim oDWGModelSpaceDef As DWGBlockDefinition = oImportedDWGComponent.ModelSpaceDefinition
        
        ' Project DWG entities to planar sketch.
        Dim oDWGEntity As DWGBlockReference
		
        For Each oDWGEntity In oDWGModelSpaceDef.BlockReferences
         
			'MsgBox("I am a point")
'			MessageBox.Show("Block Name: " & oDWGEntity.Definition.Parent.)
'            Call oSk.AddByProjectingEntity(oDWGEntity)
			
        Next
    End If

doesn't seem to present us with anything that useful when looping through the BlockReferences contained within the Underlay .dwg file.

Have I missed something obvious or perhaps another method to interrogate any potential blocks contained within the modelspace with a view to filtering on a specific AutoCAD block name and grabbing its position(s)..?