Fail to get PlanarSketch.Dependents(.Count) Property ("Not implemented" Exception)

[Maxim-CADman77]

Dear @MjDeck 
Could you, please, comment if it is normal that Inventor produces the "Not implemented" Eexception on attempt to get PlanarSketch.Dependents(.Count) Property on the IPT (2024) attached?

I'm using this iLogic-code:

Dim partDoc As PartDocument = ThisDoc.Document ' ThisPart
' Dim compDef As PartComponentDefinition = partDoc.ComponentDefinition
Dim compDef As ComponentDefinition = partDoc.ComponentDefinition

' Dim sk As PlanarSketch = compDef.Sketches(1)

For Each sk As PlanarSketch In compDef.Sketches
	Logger.Info(sk.Name)
	Try
		Logger.Info(vbTab & ".Dependents: " & sk.Dependents.Count)
	Catch ex As Exception
		Logger.Error(vbTab & ex.Message) ' Not implemented (Exception from HRESULT: 0x80004001 (E_NOTIMPL))
	End Try
Next

PS:
I see the error is somehow related to the fact that End-of-Part marker is not at the top or bottom position (the code produces no exceptions when EoP moved to either top or bottom position).

[bradeneuropeArthur]

This works for Inventor 2025:

Dim partDoc As PartDocument = ThisDoc.Document ' ThisPart
' Dim compDef As PartComponentDefinition = partDoc.ComponentDefinition
Dim compDef As ComponentDefinition = partDoc.ComponentDefinition

' Dim sk As PlanarSketch = compDef.Sketches(1)

For Each sk As PlanarSketch In compDef.Sketches
	MsgBox(sk.Name)
	Try
		MsgBox(vbTab & ".Dependents: " & sk.Dependents.Count)
	Catch ex As Exception
		msgbox(vbTab & ex.Message) ' Not implemented (Exception from HRESULT: 0x80004001 (E_NOTIMPL))
	End Try
Next

[MjDeck]

Thanks Arthur. I confirmed that Maxim's original code works in 2025 as well.

@Maxim-CADman77 , it looks like there is a problem in 2024. But it's not only caused by end-of-part. Moving the EOP does not cause this error in all parts.
But in the part you posted, in both 2024 and 2025, if you drag the EOP to the bottom there will be update errors in Extrusion15 and the sketch it consumes.