Nach EHP-8 Upgrade bei PDF Aufruf Error 400

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METHOD download.
  DATA: lo_child    TYPE REF TO if_wd_context_node,
        ls_result   TYPE        zspf_wd_res,
        lv_mimetype TYPE        mimetypes-type,
        lv_mimetype_str TYPE    string,
        lv_content  TYPE        xstring,
        lv_filename TYPE        string,
        ls_msg      TYPE        bapiret2.

  FIELD-SYMBOLS: <ls_file_result>   TYPE zspf_wd_res.

**********************************************************************
***Datei runterladen
**********************************************************************
  lo_child = me->mo_context->get_child_node( 'T_RESULT' ).
  lo_child->get_static_attributes(
    EXPORTING
      index             = me->mv_selected_index
    IMPORTING
      static_attributes = ls_result ).

  CALL FUNCTION 'SDOK_MIMETYPE_GET'
    EXPORTING
      extension                  = ls_result-filetype
*         X_USE_LOCAL_REGISTRY       =
   IMPORTING
     mimetype                   = lv_mimetype.
  lv_mimetype_str = lv_mimetype.

  zcl_pf_postfach=>get_file(
    EXPORTING
      iv_guid         = ls_result-guid
    IMPORTING
      ev_file_content = lv_content
      es_msg          = ls_msg ).
  IF ls_msg IS NOT INITIAL.
    me->raise_message( ls_msg ).
    IF ls_msg-type = 'E'.
      RETURN.
    ENDIF.
  ENDIF.


****als gelesen markieren
*  READ TABLE me->mt_file_result
*    WITH TABLE KEY guid = ls_result-guid
*    ASSIGNING <ls_file_result>.
*  <ls_file_result>-design = me->mc_design_old.
*  lo_child->set_attribute(
*    index  = me->mv_selected_index
*    value  = me->mc_design_old
*    name   = 'DESIGN' ).

***Ausgabe
  lv_filename = ls_result-filename.
  IF iv_show = abap_true.
    cl_wd_runtime_services=>attach_file_to_response(
      i_filename      = lv_filename
      i_content       = lv_content
      i_mime_type     = lv_mimetype_str
      i_in_new_window = abap_true
      i_inplace       = abap_true
      ).
  ELSE.
    cl_wd_runtime_services=>attach_file_to_response(
      i_filename      = lv_filename
      i_content       = lv_content
      i_mime_type     = lv_mimetype_str
*      i_in_new_window = ABAP_FALSE
*      i_inplace       = ABAP_FALSE
      ).
  ENDIF.


***Ergebnisliste auffrischen
  me->init_file( ).
  me->search_folder( ).
ENDMETHOD.