cmd_ei_api=>maintain_bapi with sales_data - Partner Roles Problem

Hi there,

I'm having error while creating customer using cmd_ei_api=> maintain_bapi. Here's my code block;

  DATA : lt_students TYPE TABLE OF znetth_demostudent
                     WITH HEADER LINE.
  DATA : line TYPE znetth_demopayment_transaction.
  DATA : ls_kna1 LIKE kna1.
  DATA : i_insert TYPE cmd_ei_object_task VALUE 'I'.
  DATA : ls_customers             TYPE cmds_ei_extern,
         lt_company               TYPE cmds_ei_company_t,
         ls_sales_data            TYPE cmds_ei_sales,
         ls_company               TYPE cmds_ei_company,
         ls_masterdata            TYPE cmds_ei_main,
         lt_sales_data            TYPE cmds_ei_sales_t,
         lt_customers             TYPE cmds_ei_extern_t,
         ls_master_data_correct   TYPE cmds_ei_main,
         ls_message_correct       TYPE cvis_message,
         ls_master_data_defective TYPE cmds_ei_main,
         ls_message_defective     TYPE cvis_message,
         ls_mail                  TYPE cvis_ei_smtp_str,
         lt_mail                  TYPE cvis_ei_smtp_t,
         ls_mail_main             TYPE cvis_ei_cvi_smtp,
         ls_phone_main            TYPE cvis_ei_cvi_phone,
         ls_phone                 TYPE cvis_ei_phone_str,
         lt_phone                 TYPE cvis_ei_phone_t,
         ls_fax_main              TYPE cvis_ei_cvi_fax,
         ls_fax                   TYPE cvis_ei_fax_str,
         lt_fax                   TYPE cvis_ei_fax_t,
         lt_contacts              TYPE cmds_ei_contacts_t,
         ls_contacts              TYPE cmds_ei_contacts,
         lt_message               TYPE bapiret2_t,
         ls_functions             TYPE cmds_ei_functions,
         lt_functions             TYPE cmds_ei_functions_t,
         lt_functionsmuh          TYPE cmds_ei_functions_t,
         lt_vergi                 TYPE cmds_ei_tax_ind_t,
         ls_vergi                 TYPE cmds_ei_tax_ind.
  DATA error TYPE cvis_message.
*  CONSTANTS: c_update TYPE c VALUE 'M', c_insert TYPE c VALUE 'I'.

  REFRESH lt_students.
  LOOP AT lt_payment_transaction INTO line.
    SELECT SINGLE * FROM kna1
                    INTO ls_kna1
                    WHERE stcd2 = line-student-tckn.
    IF sy-subrc <> 0.
      lt_students = line-student.
      APPEND lt_students.
    ENDIF.
  ENDLOOP.
  SORT lt_students ASCENDING BY tckn.
  DELETE ADJACENT DUPLICATES FROM lt_students COMPARING tckn.

  LOOP AT lt_students.
    ls_customers-header-object_task = i_insert.
    ls_customers-header-object_instance-kunnr = ' '.
    ls_customers-central_data-central-data-ktokd = 'YOGR'.
    ls_customers-central_data-central-datax-ktokd = 'X'.
    ls_customers-central_data-address-task = i_insert.
    ls_customers-central_data-address-postal-data-from_date = sy-datum.
    ls_customers-central_data-address-postal-data-to_date = '99991231'.
    ls_customers-central_data-address-postal-data-country = 'TR'.
    ls_customers-central_data-address-postal-data-langu = 'T'.
    ls_customers-central_data-address-postal-data-region =
                                       lt_students-city_code.
    ls_customers-central_data-address-postal-data-district =
                                       lt_students-district.
    ls_customers-central_data-address-postal-data-name =
                                lt_students-full_name.
    ls_customers-central_data-address-postal-data-name_3 =
                                              lt_students-address.


    ls_customers-central_data-address-postal-datax-from_date = 'X'.
    ls_customers-central_data-address-postal-datax-to_date = 'X'.
    ls_customers-central_data-address-postal-datax-country = 'X'.
    ls_customers-central_data-address-postal-datax-langu = 'X'.
    ls_customers-central_data-address-postal-datax-region = 'X'.
    ls_customers-central_data-address-postal-datax-district = 'X'.
    ls_customers-central_data-address-postal-datax-name = 'X'.
    ls_customers-central_data-address-postal-datax-name_3 = 'X'.

    IF lt_students-parent1 IS NOT INITIAL.
      ls_contacts-task = i_insert.
      ls_contacts-address_type_3-postal-data-firstname =
                                lt_students-parent1-name.
      ls_contacts-address_type_3-postal-data-lastname =
                                      lt_students-parent1-surname.
      ls_contacts-address_type_3-postal-datax-firstname = 'X'.
      ls_contacts-address_type_3-postal-datax-lastname  = 'X'.
      APPEND ls_contacts TO lt_contacts.
    ENDIF.



    IF lt_students-parent2 IS NOT INITIAL.
      ls_contacts-task = i_insert.
      ls_contacts-address_type_3-postal-data-firstname =
                                lt_students-parent2-name.
      ls_contacts-address_type_3-postal-data-lastname =
                               lt_students-parent2-surname.
      ls_contacts-address_type_3-postal-datax-firstname = 'X'.
      ls_contacts-address_type_3-postal-datax-lastname  = 'X'.
      APPEND ls_contacts TO lt_contacts.
    ENDIF.



    ls_vergi-task = i_insert.
    ls_vergi-data_key-aland = 'TR'.
    ls_vergi-data_key-tatyp = 'MWST'.
    ls_vergi-data-taxkd = '1'.
    ls_vergi-datax-taxkd = 'X'.
    APPEND ls_vergi TO lt_vergi.

    ls_sales_data-task = i_insert.
    ls_sales_data-data_key-vkorg = '1000'.
    ls_sales_data-data_key-vtweg = '10'.
    ls_sales_data-data_key-spart = '10'.
    ls_sales_data-data-waers = 'TRY'.
    ls_sales_data-data-vkbur = '9999'.
    ls_sales_data-data-kvgr1 = lt_students-school_code.
    ls_sales_data-data-kvgr2 = lt_students-class.
    ls_sales_data-data-kalks = '2'.
    ls_sales_data-data-versg = '1'.
    ls_sales_data-data-zterm = '0000'.
    ls_sales_data-data-ktgrd = '01'.
    ls_sales_data-data-vwerk = '1000'.
    ls_sales_data-data-mrnkz = 'X'.
    ls_sales_data-data-bokre = 'X'.
    ls_sales_data-data-prfre = 'X'.

    ls_sales_data-datax-waers = 'X'.
    ls_sales_data-datax-vkbur = 'X'.
    ls_sales_data-datax-kvgr1 = 'X'.
    ls_sales_data-datax-kvgr2 = 'X'.
    ls_sales_data-datax-kalks = 'X'.
    ls_sales_data-datax-versg = 'X'.
    ls_sales_data-datax-zterm = 'X'.
    ls_sales_data-datax-ktgrd = 'X'.
    ls_sales_data-datax-vwerk = 'X'.
    ls_sales_data-datax-mrnkz = 'X'.
    ls_sales_data-datax-bokre = 'X'.
    ls_sales_data-datax-prfre = 'X'.


    ls_functions-task = i_insert.
    ls_functions-data_key-parvw = 'AG'.
    ls_functions-data-partner = ls_customers-header-object_instance-kunnr. "INTERNAL"
    APPEND ls_functions TO lt_functions.

    ls_functions-task = i_insert.
    ls_functions-data_key-parvw = 'RE'.
    ls_functions-data-partner = ls_customers-header-object_instance-kunnr. "INTERNAL"
    APPEND ls_functions TO lt_functions.

    ls_functions-task = i_insert.
    ls_functions-data_key-parvw = 'RG'.
    ls_functions-data-partner = ls_customers-header-object_instance-kunnr. "INTERNAL"
    APPEND ls_functions TO lt_functions.

    ls_functions-task = i_insert.
    ls_functions-data_key-parvw = 'WE'.
    ls_functions-data-partner = ls_customers-header-object_instance-kunnr. "INTERNAL"
    APPEND ls_functions TO lt_functions.

    lt_functionsmuh[] = lt_functions[].
    ls_sales_data-functions-functions = lt_functionsmuh.


    ls_company-task = i_insert.
    ls_company-data_key-bukrs = '1000'.
    ls_company-data-akont = '0012010200'.
    ls_company-data-fdgrv = 'MYOGR'.
    ls_company-data-zterm = '0000'.
    ls_company-datax-akont = 'X'.
    ls_company-datax-zterm = 'X'.
    ls_company-datax-fdgrv = 'X'.

    ls_customers-central_data-address-communication-smtp = ls_mail_main.
    ls_customers-central_data-address-communication-phone = ls_phone_main.
    ls_customers-central_data-address-communication-fax = ls_fax_main.
    ls_customers-central_data-tax_ind-tax_ind = lt_vergi .
    APPEND ls_company TO lt_company.
    APPEND ls_sales_data TO lt_sales_data.


    ls_customers-sales_data-sales = lt_sales_data.
    ls_customers-central_data-contact-contacts = lt_contacts.
    ls_customers-company_data-company = lt_company.
    APPEND ls_customers TO lt_customers.

    ls_masterdata-customers = lt_customers.
    break xuser-abap.

    cmd_ei_api=>maintain_bapi(
        EXPORTING
        iv_collect_messages      = 'X'
        is_master_data           = ls_masterdata
        IMPORTING
        es_master_data_correct   = ls_master_data_correct
        es_message_correct       = ls_message_correct
        es_master_data_defective = ls_master_data_defective
        es_message_defective     = ls_message_defective  ).


    IF ls_message_defective-is_error IS INITIAL.
      COMMIT WORK AND WAIT.
    ENDIF.
  ENDLOOP.

I'm getting theese errors;

error means in english => cmd_ei_api maintain method error knvp-kunn2 -lifnr -pernr -parnr plausibility.

Have anyone have any idea for this issue? Please let me where i'm wrong.