COBCH1796 GET/SET PROPERTY は GET PROPERTY をオーバーライドできない

A property with both get and set accessors cannot override a get property in an inherited class.

In the following example, this error is returned for PropG1:

       class-id a public abstract.
       property-id PropG1 string abstract.
       getter.
       end property.
       end class.

       class-id b inherits type a.
       01 PropG1        string public property override.
       end class.