SAP Workflow: How to read Multi-Line container of a Work item

Here is a sample code for reading multi-line, BOR, Objects in a work item container

* For multi line class attribute of a container
  DATA: lv_wi_handle TYPE REF TO if_swf_run_wim_internal,
  cnt TYPE REF TO if_swf_cnt_container,
  l_req_wf_attribs TYPE REF TO cl_pt_req_wf_attribs.

* Get the instance of the workitem
  CALL METHOD cl_swf_run_wim_factory=>find_by_wiid
      EXPORTING
          im_wiid     = wa_wf_data-wi_id
      RECEIVING
            re_instance = lv_wi_handle.

* Get the container
  cnt = lv_wi_handle->get_wi_container( ).

* Get the required attribute from the container
  CALL METHOD cnt->if_swf_cnt_element_access_1~element_get_value
      EXPORTING
             name  = 'REQ' " Name of your object
      IMPORTING
             value = l_req_wf_attribs.