Program exits when message manager capture an error

Hi Buddies,
I am new to web dynpro for ABAP and now I am doing some exercises.
In method check_input, I coded to capture an error using message manager. However, I find method FLIGHTTAB_FILL continue to run. I am wondering if there are some indicators (I find sy-subrc is still initial...any other indicators??) I could use to stop the program when an error is captured? Please advice. Thanks.
method FLIGHTTAB_FILL .
  wd_this->check_input(
endmethod.
Kind Regards,
Clark

Hi,
If you use is_empty method, you can identify.
ABAP_TRUE if Message List Is Empty. So in your case, if messages are populated, space will be the value of the Boolean.
** get message manager
DATA lo_api_controller     TYPE REF TO if_wd_controller.
DATA lo_message_manager    TYPE REF TO if_wd_message_manager.
data lv_bool type abap_bool.
data lt_messages type if_wd_message_manager=>ty_t_messages.
lo_api_controller ?= wd_this->wd_get_api( ).
CALL METHOD lo_api_controller->get_message_manager
  RECEIVING
    message_manager = lo_message_manager
    .DATA lv_message            TYPE string.
DATA lv_message_type       TYPE i.
lv_message_type = if_wd_message_manager=>co_type_standard.
* report message
CALL METHOD lo_message_manager->report_success
  EXPORTING
    message_text              =  'Success'.
* report message
"ABAP_TRUE if Message List Is Empty

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