Version:           4.0.60 (using KDevPlatform 1.0.60) (using 4.4.3 (KDE 4.4.3), Debian packages)
OS:                Linux (x86_64) release 2.6.32-3-amd64

Create foo.h, and type this:

class Foo {
public:
    friend int do_something(Foo& foo);
};

Move mouse over do_something. The tooltip says Foo is the function's container; but do_something is not even a member function.

Create foo.cpp, and type this:

#include "foo.h"

Then go to the next empty line and press Ctrl-Space. It offers "Implement Function: Implement int Foo::do_something(Foo& foo)".

Press Enter on that completion item. KDevelop inserts the following code:
int Foo::do_something(Foo& foo)
{

}

g++ 4.4.4 gives the following error when compiling that generated code:
foo.cpp:7: error: no ‘int Foo::do_something(Foo&)’ member function declared in class ‘Foo’

Both the completion item and the inserted code have "Foo::", which is incorrect. do_something is a normal function and a friend of class Foo, not a member function of Foo.