Clear Custom statuses from Messages?

Question

Hello,
I am wondering if there's a way to clear custom away and custom available statuses from the drop down menu in Messages. After years of use, the list is quite long and many of them are

Answer 1

The thing is he "old" / standard code isn't executed. I tried using a break point there to see if it will be executed, but it didn't stop at all .
Here is the code.
IF param1-value = 'InteractionEndRequest'.
*    BREAK-POINT.
     DATA:           lr_messagetab        TYPE         crmt_genil_mess_cont_tab,
                         lr_core              TYPE REF TO  cl_crm_bol_core,
                         lr_message_container TYPE REF TO  if_genil_message_container,
                         lr_mess_core         TYPE REF TO  cl_crm_genil_mess_cont_manager.
     lr_core        = cl_crm_bol_core=>get_instance( ).
     lr_mess_core   = lr_core->get_message_cont_manager( ).
     lr_mess_core->get_all_message_containers(
                 IMPORTING et_result =  lr_messagetab ).
     LOOP AT lr_messagetab INTO lr_message_container.
       lr_message_container->delete_messages( ).
     ENDLOOP.
   ENDIF.