Use SAP_WAPI_READ_CONTAINER to read all container element

Hi All,
I am writing an ABAP to read message texts from a workflow container. The text is stored in a container element called RejectionTexts which is a multiline container element.
When I call the Function Module SAP_WAPI_READ_CONTAINER it brings be back the "standard" container elelments but doesn't return the element RejectionTexts.
Am I doing something wrong or is there another FM for getting the other container elements?
DATA: lt_container LIKE swr_cont OCCURS 0 WITH HEADER LINE.
DATA: lt_worklist TYPE swr_wihdr OCCURS 0 WITH HEADER LINE. "PH9K008190
DATA: lt_message_lines LIKE swr_messag OCCURS 0 WITH HEADER LINE,
      lt_message_struct LIKE swr_mstruc OCCURS 0 WITH HEADER LINE,
      lt_subcontainer_bor_objects LIKE swr_cont OCCURS 0 WITH HEADER
LINE,
      lt_subcontainer_all_objects LIKE swr_cont OCCURS 0 WITH HEADER
LINE.
lt_worklist-wi_id = '495105'.
CALL FUNCTION 'SAP_WAPI_READ_CONTAINER'
EXPORTING
    workitem_id                    = lt_worklist-wi_id
*   LANGUAGE                       = SY-LANGU
*   USER                           = SY-UNAME
* IMPORTING
*   RETURN_CODE                    =
TABLES
    simple_container               = lt_container
   message_lines                   = lt_message_lines
   message_struct                  = lt_message_struct
   subcontainer_bor_objects        = lt_subcontainer_bor_objects
   subcontainer_all_objects        = lt_subcontainer_all_objects.

It looks like that if there is no value on the container for RejectionText the container element doesn't come through as a blank (even though the other container elements come through if they are blank).
Once I manually popuated an entry and read the container again the value appeared.
Thanks for the help,
Colm

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