Raise error message, it should not allowed to save in WEBUI

Hi,    

     I raising the error message in web ui using below code. Message is displaying in web ui, But it is allowing to save.

     lr_core = cl_crm_bol_core=>get_instance( ).
    if lr_core is bound.
      lr_global_messages ?= lr_core->get_global_message_cont( ).
    endif.
    if lr_global_messages is bound.
      call method lr_global_messages->add_message
        exporting
          iv_msg_type       = 'E'
          iv_msg_id         = 'ZCRM'
          iv_msg_number     = '000'
          iv_msg_text       =  'test'

iv_show_only_once = 'X'
          iv_msg_level      = 0.