Solution : https://service.sap.com/sap/support/notes/1112337 (SAP Service marketplace login required)
Key words : 
gc_frp_safin_calupdate_log => 'calibrationupgrade' gc_frp_safrun_calupdate => 'calibrationupgrade' save, object type /fre/cl_const, call transaction se24, existing data relating, automatic parameter optimization, automatic transfer, error occurs, upgrade reason, forecast calculation, replenishment processor
Related Notes : 
       
| 1289161 | Consulting note: Procedure for upgrading SAP F&R 5.0 to 5.1 | 
| 996408 | Additions to the SCM 5.1 Forecasting & Replenishment upgrade |