Compiler Error C3243

none of the overload functions were introduced by 'interface'

You tried to explicitly override a member that does not exist in the specified interface.

The following sample generates C3243:

// C3243.cpp
#pragma warning(disable:4199)
__interface IX14A {
   void g();
};

__interface IX14B {
   void f();
   void f(int);
};

class CX14 : public IX14A, public IX14B {
public:
   void IX14A::g();
   void IX14B::f();
   void IX14B::f(int);
};

void CX14::IX14A::f()   // C3243 occurs here
{
}