catch blocks

```abap
    CATCH cx_salv_not_found INTO DATA(lx_not_found).
      MESSAGE lx_not_found TYPE 'E'.
    CATCH cx_salv_data_error INTO DATA(lx_data_error).
      MESSAGE lx_data_error TYPE 'E'.
    CATCH cx_salv_existing INTO DATA(lx_existing).
      MESSAGE lx_existing TYPE 'E'.
    CATCH cx_salv_wrong_call INTO DATA(lx_wrong_call).
      MESSAGE lx_wrong_call TYPE 'E'.
  ENDTRY.
```