Could not find attribute PRAKZ

Dear Experts,

I'm getting a dump on the below line piece of code in the standard component HRESS_C_CATS

Component Controller->ON_OVS( ) Line 326

*        Some fields are related to each other and thus it is required to populate the
*        other field automatically if required
         IF lv_tecname = 'PRAKN'.
           ASSIGN COMPONENT 'PRAKZ' OF STRUCTURE <ls_selection> TO <dyn_fs>.
           ovs_callback_object->context_element->set_attribute(
                      name  = 'PRAKZ'
                      value = <dyn_fs> ).

Please help.