COBCH1611 Can only specify accessor visibility if property has both GETTER and SETTER

If you specify the visibility of either a GETTER or SETTER phrase, the property must contain both a GETTER and a SETTER phrase, but only one phrase can specify the visibility.

class-id myClass1.
property-id myProp1 string public.
    setter protected.			*> this is correct
    set property-value to "1234"
    getter.
    set myString to property-value
end property.
end class.