Solution : https://service.sap.com/sap/support/notes/996408 (SAP Service marketplace login required)
Key words : 
time series key figure parameters, metric demand influencing factors, time series delta handling, boolean demand influencing factors, system table /fre/tskprm, support package level prior, automatic parameter optimization functions, parameter optimization                     additional parameters, upgrade extraordinary technical initialization, note describes additional activities
Related Notes : 
       
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| 1289161 | Consulting note: Procedure for upgrading SAP F&R 5.0 to 5.1 | 
| 1250966 | Report /FRE/UI_FRE_INITIAL enhanced for Release F&R 5.1 | 
| 1250862 | Enhancements to upgrade SCM F&R, Release 7.0 and higher | 
| 1235074 | Corrections in FRP 4.1.0 (Patch 002) | 
| 1226647 | Wrong Time Series Configuration after Upgrade to F&R 5.1 | 
| 1114675 | F&R TS: Delta handling for cons. ref and ref. modules fix | 
| 1112337 | First FRP run after upgrading to F&R 5.1 | 
| 1082835 | Installing FRP 4.1.0 | 
| 1001289 | DIF consideration on daily basis - compatibility |