Создание ключа (ADOX)

По материалам: https://www.everythingaccess.com/tutorials.asp?ID=ADOX-programming-examples#ShowAllTables

Function CreateKeyAdox()
    'Purpose:   Show how to create relationships using ADOX.
    Dim cat As New ADOX.Catalog
    Dim tbl As ADOX.Table
    Dim ky As New ADOX.Key
    
    Set cat.ActiveConnection = CurrentProject.Connection
    Set tbl = cat.Tables("tblAdoxBooking")
    
    'Create as foreign key to tblAdoxContractor.ContractorID
    With ky
        .Type = adKeyForeign
        .Name = "tblAdoxContractortblAdoxBooking"
        .RelatedTable = "tblAdoxContractor"
        .Columns.Append "ContractorID"      'Just one field.
        .Columns("ContractorID").RelatedColumn = "ContractorID"
        .DeleteRule = adRISetNull   'Cascade to Null on delete.
    End With
    tbl.Keys.Append ky
    
    Set ky = Nothing
    Set tbl = Nothing
    Set cat = Nothing
    Debug.Print "Key created."
End Function