I have used a pre-existing implementation of BADI /SAPAPO/SDP_SELECTOR to implement the method COMPONENT_VALUE_LIST (its method INIT_OBJECT_LIST was already implemented in our system).
I've activated the code and re-activated the implementation.
At runtime, the method COMPONENT_VALUE_LIST is empty in the debugger.
No other implementation of this BADI exists.
The other implemented method INIT_OBJECT_LIST is correctly executed at runtime.