How to handle exception thrown in standard bo method in the workflow design

Question

Hi Experts
    how to handle exception thrown from standard bo method in the workflow design. For example, bo BUS2032, METHOD confirm. If the user cancel it, it will throw exception. In the workflow, how to catch this exception and add corresponding steps in the workflow.

Answer 1

@jrockman li
Try to implement the logic that what ever you are performing in the BO mehtod in a FM and in the FM you have tab with name EXECPTIONS define the execption in that tab.Now in the BO method you call this FM  and if the exception occurs by using RAISE you can raise the exception in the FM and based on the number of exceptions your sy-subrc value will be set
so when sys-subrc is not eq 0 then pass a value back t the workflow container., I think this will work.
a sample Snippet for understanding purpose
CALL FUNCTION 'GUI_DOWNLOAD'
  EXPORTING
    filename         = <path>
    filetype         = 'ASC'
  IMPORTING
    filelength       = lv_len
  TABLES
    data_tab         = l_txt_tab
  EXCEPTIONS
    file_write_error = 1          " If this Exception occurs
    invalid_type     = 2
    no_authority     = 3
    unknown_error    = 4
    OTHERS           = 10.
CASE sy-subrc.
  WHEN 1. " SY-SUBRC value will be 1 then,
      " Pass or set the value back to the workflow conatiner element
ENDCASE.