E2179 Only register calling convention allowed in OLE automation section (Delphi)

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You have specified an illegal calling convention on a method appearing in an 'automated' section of a class declaration.

program Produce;

  type
    Base = class
    automated
      procedure Method; cdecl;
    end;

  procedure Base.Method; cdecl;
  begin
  end;

begin
end.

The language specification disallows all calling conventions except 'register' in an OLE automation section. The offending statement is 'cdecl' in the above code.

program Solve;

  type
    Base = class
    automated
      procedure Method; register;
      procedure Method2;
    end;

  procedure Base.Method; register;
  begin
  end;

  procedure Base.Method2;
  begin
  end;

begin
end.

There are three solutions to this error. The first is to specify no calling convention on methods declared in an auto section. The second is to specify only the register calling convention. The third is to move the offending declaration out of the automation section.