Report on 0filg_v10 will give you real data as the report run over virtual cube.
I will suggest go to LISTCUBE and run it for above cube.
Correct me if I am worng, this is running over the New GL flow in ECC which refers FAGLFLEXT and FAGLFLEXA table.
I will suggest check the yearwise entry in above table and compare with BW cube and try to find the problem.
http://help.sap.com/saphelp_tm80/helpdata/en/f2/e16840b151181ce10000000a1550b0/content.htm
says it uses
General Ledger (New): Transaction Figures (0FIGL_C10) as well so need to check the entries in that cube too.
Thank-You.
Regards,
VB