Solution : https://service.sap.com/sap/support/notes/1709947 (SAP Service marketplace login required)
Key words : 
prerequisites programm error solution sap netweaver bw 7, terms fieldlisttransformation'objects_objref_not_assigned''cx_sy_ref_is_initial'cl_rstran_trfn_vers=>get_one_to_oners_exception000dereference, software component   sap_bw                        business inform, manual post-implementation step manually, preliminary version sapbwnews nw bw 7, class 'cl_rstran_trfn_vers' method 'get_one_to_one', short dump 'objects_objref_not_assigned''cx_sy_ref_is_initial', preliminary version sapbinews nw7, manual post-implement, sapbwnews nw bw 7
Related Notes : 
       
| 1708177 | SAPBWNews NW BW 7.31 ABAP SP5 | 
| 1680997 | SAPBWNews NW BW 7.30 ABAP SP8 | 
| 1680996 | |
| 1665768 | SAPBWNews NW BW 7.01 ABAP SP12 | 
| 1658505 | SAPBWNews NW7.0 BW ABAP SP29 | 
| 1636053 | Upgrade to SAP NetWeaver 7.30: BW server: Useful SAP Notes |