E2231 '%s' directive not allowed in dispinterface type (Delphi)

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You have specified a clause in a dispinterface type which is not allowed.

program Produce;

  type
    IBase = dispinterface
    ['{00000000-0000-0000-0000-000000000000}']
      function Get : Integer;

      property BaseValue : Integer read Get;
    end;

    IExt = interface (IBase)
    end;


begin
end.
	program Solve;

  type
    IBase = dispinterface
    ['{00000000-0000-0000-0000-000000000000}']
      function Get : Integer;

      property BaseValue : Integer;
    end;

begin
end.