HRFORMS_CALL_PDF using form_object_list

hi,

Im trying to call the FM HRFORMS_CALL_PDF using an hrform ref table but i only get the pdf from one of the hrforms. My code is parcilally this:

lo_hrform             TYPE REF TO object,
lt_hrform_list        like TABLE OF lo_hrform

(...)

loop on pernr.

(...)

     CALL FUNCTION 'HRFORMS_CALL_PERNR'
              EXPORTING
                form_object        = lo_hrform

     append lo_hrform to lt_hrform_list.

endloop.

(...)

CALL FUNCTION 'HRFORMS_CALL_PDF'
         EXPORTING
"          form_object = lo_hrform
            form_object_list = lt_hrform_list

IMPORTING
           pdf_xstring = ls_pdf

(...)

Ls_pdf always return the pdf belonging to only one of the hrform. The lt_hrform_list seems to have all the several hrforms inside. Even if i call 'HRFORMS_CALL_DISPLAY'

     IMPORTING

     FORM_OBJECT_LIST  = lt_hrform_list'

i can see all the hrform pdfs. Can anyone help me understand this?