Solution : https://service.sap.com/sap/support/notes/753735 (SAP Service marketplace login required)
Key words : 
terms /sapapo/cif_sl_doc_ex/sapapo/cif_sl_doc_ex_x/sapapo/cif_de_tpds_type/sapapo/eldat/sapapo/eluhr/sapapo/cif_de_consflg/sapapo/rldat/sapapo/rluhr reason, solution import support package 2, apo backorder processing, missing fields, transferring, facing_locationfacing_loctypefirst_stock_locationfirst_stock_loctypetpds_typeitm_anchoritm_own_quantitytyreqqty_unrndeldateluhrtemp_obj_modeconsflgrldatrluhr, prerequisites, note 740267
Related Notes : 
       
| 758673 | BOP: Error in the /SAPAPO/CIF_SL_DOC_EX structure | 
| 740267 | |
| 375193 | Backorder processing: Composite SAP note on posting |