Solution : https://service.sap.com/sap/support/notes/1373594 (SAP Service marketplace login required)
Key words : 
data element--------------------------------quantity fkimg            unit_measure vrkme            id_number matnr            descript arktx            unit_price netwr_fp            amount_net netwr_fp            customs_data idmx_di_t_customs_data            prop_ac_num            compl_goods            3, cust_doc                                    char    20date_doc_issued                              char    10office_doc_issued                            char    80 create table type idmx_di_t_customs_datageneral attributes, key fields  0000genericmain memory size   00000proxy usage modify structure idmx_di_line_items_typremove, run transaction se11 create structure idmx_di_customs_data_typgeneral attributes, idmx_di_control            idmx_di_save_data            idmx_di_sd_oim            idmx_di_or_input_msg            idmx_di_get_data            idmx_di_get_sd_data            idmx_di_get_fi_data 2, idmx_di_customs_data_typaccess mode        standard tablekey                standard keykey category, customs datatable category    structureproxy usagetable view maint, row type   structured typerow type, run transaction se37 delete, support multiple customs data
Related Notes : 
       
| 1321680 | Digital Invoice Mexico: IDoc basic type FIDCCP02 Extension | 
| 1318342 | Digital Invoice Mexico: IDoc basic type INVOIC02 Extension |