ET_SERVICE_I fields not getting updated using CRM_ORDER_MAINTAIN

Hi Experts,

I am working on data migration program to upload service requests using crm_order_maintain. The issue with IT_SERVICE_I fileds not getting updated. All the remaining parameters like it_appointment, it_service_h, it_orgman, it_partner... Only the fields of IT_SERVICE_I are not updating. Am able to see the values in debugging for the fields.

I tried in many ways by passing Object Guid and Item Guid for ref_guid field of it_service_i. But still the fields are not getting updated. I am not sure what am missing. Please find below my code.

Please suggest.

CALL FUNCTION 'GUID_CREATE'

       IMPORTING

         ev_guid_16 = lv_item_guid.

     CLEAR gt_service_i.

*    gs_service_i-ref_handle = '0000000001'.

     gs_service_i-ref_guid = lv_item_guid.

     gs_service_h-ref_kind = 'B'.

     gs_service_i-zzafld0000XX = <fs_excel_data>-XX.

     gs_service_i-zzafld0000YY = <fs_excel_data>-YY

     gs_service_i-zzafld0000ZZ = <fs_excel_data>-ZZ.

     APPEND gs_service_i TO gt_service_i.

     CLEAR gs_service_i.

*** Input fields for IT_SERVICE_I

*    gs_input_fields-ref_handle = '0000000001'.

     gs_input_fields-ref_guid =  lv_item_guid.

*    READ TABLE lt_obj_guid INTO  gs_service_i-ref_guid INDEX 1.

     gs_input_fields-ref_kind = 'B'.

     gs_input_fields-objectname = 'SERVICE_I'.

     gs_field_line-fieldname = 'ZZAFLD0000XX'.

     INSERT gs_field_line INTO TABLE gs_input_fields-field_names.

     gs_field_line-fieldname = 'ZZAFLD0000YY'.

     INSERT gs_field_line INTO TABLE gs_input_fields-field_names.

     gs_field_line-fieldname = 'ZZAFLD0000ZZ'.

     INSERT gs_field_line INTO TABLE gs_input_fields-field_names.

     INSERT gs_input_fields INTO TABLE gt_input_fields.

CALL FUNCTION 'CRM_ORDER_MAINTAIN'

       EXPORTING

         it_appointment    = lt_appointment

         it_orgman         = lt_orgman

         it_ext_ref        = lt_ext_ref

         it_partner        = lt_partner

         it_text           = lt_text

         it_activity_h     = lt_activity_h

         it_status         = lt_status

         it_srv_req_h      = lt_srvreq_h

         it_service_h      = lt_service_h

         it_service_i      = lt_service_i

       CHANGING

         ct_orderadm_h     = ct_ordradm_h2

         ct_input_fields   = ct_input_fields

         ct_doc_flow       = ct_docflow

       EXCEPTIONS

         error_occurred    = 1

         document_locked   = 2

         no_change_allowed = 3

         no_authority      = 4

         OTHERS            = 5.

Thanks & Regards,

Varma