ABAP Whereused issue

In a class implementing an Interface.

eg

Class A.

Interfaces: If_cust_object.

METHOD If_cust_object~initial_sync.

place cursor on method Name

press where used list.

No results...

If you go inside the interface definition.

Interface If_cust_object.

methods Initial_sync.

place cursor on method Name

press where used list.

you get the list....

Stepped on that rake today. Got smacked in the face with a call point not fixed.

In other languages eg c# and in ECLIPSE ADT, the whereused list is shown in both cases.

Why not in ABAP ? Is that a Bug in whereused that the interface isnt checked properly?

Nice trap.