Question

I get a VBA Excel ‘Compiler Error: Object required’-Error in the marked line.
I do not understand the reason.

BTW: Wish Excel would support a .Net language without wrapper needs.

Option Explicit

Public Type Inherit
    ReqId As Integer
    Parent As Integer
    Depth As Integer
    Path As String
End Type

Sub test()
    Dim MyStructure() As Inherit
    ReDim MyStructure(1 To 1000)

    MyStructure(1).ReqId = 1

    Dim Data, refData As Inherit
    Set Data = MyStructure(1)  ' <---! 
    Beep

End Sub

Answer 1

Set is for the assignment of objects, a user defined type is treated like a regular variable so use = to assign.

Also (confusingly); Dim Data, refData As Inherit only declares refData of type Inherit to declare them both on one line you must; Dim Data As Inherit, refData As Inherit