Although this specific example doesn‘t reproduce the problem in a small project, this caused the problem in a larger project. The function was defined as follows:
interface
function CompareItemEqualStatus(const Value1:TSomeEnumeratedType;
const Value2: TSomeEnumeratedType): Integer;
implementation
function CompareItemEqualStatus(const Value1: TSomeEnumeratedType;
const Value2: TSomeEnumeratedType): Integer; overload;
begin
...
end;