Solution : https://service.sap.com/sap/support/notes/400662 (SAP Service marketplace login required)
Key words : 
structure/sapapo/cif_sl_doc_excomponent                  component typepersist_id                cux_persist_idstructure /sapapo/cif_sl_doc_ex_xcomponent                  component typepersist_id                 bapiupdateuse transaction se37, it_sl_cublb                    bapicublbit_sl_cucfg                    bapicucfgit_sl_cuins                    bapicuinsit_sl_cuprt                    bapicuprtit_sl_cuval                    bapicuvalit_sl_cuvk                      bapicuvkit_sl_vbxdata                  vbx_s_datait_sl_vbxhead                  vbx_s_headplease, ix_cublb                          bapicublbix_cucfg                          bapicucfgix_cuins                          bapicuinsix_cuprt                          bapicuprtix_cuval                          bapicuvalix_cuvk                          bapicuvkix_vbxdata                        vbx_s_dataix_vbxhead                        vbx_s_head, /component       data element/component typepersist_id                 char32also expand, /component       data element/component typepersist_id                bapiupdateplease, additional key words bop, prerequisites missing functionality solution, add optional table parameters, transaction se37, optional table parameters
Related Notes : 
       
| 442259 | Backorder processing: Configuration characteristics | 
| 426120 | Backorder processing: Changing short description | 
| 426039 | Backorder processing: Syntax error VBX_S_DATA, VBX_S_HEAD | 
| 415244 | Release restrictions R/3 Plug-In 2001.1 | 
| 408776 | Backorder processing: Results display terminates | 
| 401255 | Interface enhancement for sales order re: configuration | 
| 398486 | Backorder processing: Configuration characteristics | 
| 394471 | Backorder processing: BOMs | 
| 393274 | Transfer of new characteristic valuations to R/3 | 
| 375193 | Backorder processing: Composite SAP note on posting |