BAPI_PO_CREATE1 fehlt Headereingabe, aber welche?

Code: Alles auswählen.

    ls_header-comp_code   = ls_ekko_alv-bukrs.
    ls_headerx-comp_code   = 'X'.
    ls_header-doc_type    = ls_ekko_alv-bsart.
    ls_headerx-doc_type   = 'X'.
    ls_header-item_intvl  = 00001.
    ls_header-item_intvl  = 'X'.
    ls_header-creat_date  = ls_ekko_alv-aedat.
    ls_headerx-creat_date = 'X'.
    ls_header-created_by  = ls_ekko_alv-ernam.
    ls_headerx-created_by = 'X'.
    ls_header-vendor      = ls_ekko_alv-lifnr.
    ls_headerx-vendor     = 'X'.
    ls_header-currency    = ls_ekko_alv-waers.

    ls_header-pmnttrms    = ls_ekko_alv-zterm. "Zahlungsbedingungsschlüssel
    ls_headerx-pmnttrms   = 'X'.
    ls_header-purch_org   = ls_ekko_alv-ekorg. "Einkaufsorganisation
    ls_headerx-purch_org  = 'X'.
    ls_header-pur_group   = ls_ekko_alv-ekgrp. "Einkäufergruppe
    ls_headerx-pur_group  = 'X'.
    ls_header-langu       = sy-langu.
    ls_headerx-langu      = 'X'.

Code: Alles auswählen.

*   Bestellung anlegen
    CALL FUNCTION 'BAPI_PO_CREATE1'
      EXPORTING
        po_header                  = ls_header
        po_headerx                 = ls_headerx
    IMPORTING
      purchaseorder                = lv_purchaseorder
      TABLES
        poitem                     = lt_poitem
        poitemx                    = lt_poitemx
*      PO_ITEM_ADD_DATA
        poschedule                 = lt_sched
        poschedulex                = lt_schedx
        poaccount                  = lt_acc
        poaccountx                 = lt_accx
*      PO_ITEM_TEXT
        return                     = lt_return
*      po_limits
*      po_contract_limits
*      po_services
*      po_srv_accass_values
*      po_services_text
*      po_business_partner
*      extensionin
*      poaddrdelivery
*      nfmetallitms
  .