Hi Yury, >Could you explane,please, if it is a compiler bug or just the compiler feature. It is neither a compiler bug, nor a compiler feature. It is compliance to C++ specification (ISO 14882). The Set in the parent class is being hidden by the Set in the derived class. You should be able to un-hide the Set from the parent class in the derived class by specifying... using A<EntityName>::Set; ... in the derived class. HTH, --Eljay
