Solution : https://service.sap.com/sap/support/notes/121096 (SAP Service marketplace login required)
Key words : 
if_vbeln_lp       vbap-vbeln                                 xif_posnr_lp       vbap-posnr                                 xif_current_year   vblb-vjkun                            xif_previous_year  vblb-vjkun                            xexport parameters ref, function library creates include lv50zu05, open scheduling agreements/sales orders, additional key words md73, ef_korsum         lips-lgmng                                 xexceptions, change import parameters, delete unnecessary procurement elements, 'source code corrections' section, attached source code section, copy function module'sd_delivery_cumulative_set'
Related Notes : 
       
| 191939 | Component supplier: MCVBEL incorrect for VL04/VL10 | 
| 65575 | Comp.suppl.proc.: Transf.requirements incorrect | 
| 64453 | Comp.supplier: Wrong SD document indices and reqs | 
| 60196 | Goods issue cumulative quantity is not correct |