An SAP Consultant

 "Get all pending work items
  SELECT WI_ID WI_TYPE WI_STAT TOP_WI_ID
    FROM SWWWIHEAD
    INTO TABLE IT_PLVE_WITEMS
   WHERE WI_TYPE     = 'W'
     AND WI_STAT     = 'READY'
     AND WI_RH_TASK  = C_WORFLOW_TASK.

IF IT_PLVE_WITEMS IS NOT INITIAL.
    "Current Work Items Assigned to a User
    SELECT USER_ID WI_ID TASK_OBJ
      FROM  SWWUSERWI
      INTO TABLE IT_WI_AGENT
      FOR ALL ENTRIES IN IT_PLVE_WITEMS
     WHERE WI_ID     = IT_PLVE_WITEMS-WI_ID
       AND TASK_OBJ  = C_WORFLOW_TASK
       AND NO_SEL    = SPACE.
  ENDIF.