Solution : https://service.sap.com/sap/support/notes/1121318 (SAP Service marketplace login required)
Key words : 
sap tree logistics->central functions->variant configuration->modeling environment, entering transaction st13-> select tool varconf-> project cup, group local class pro proceduref cuov, terms performance variant configuration configuration model reason, simple modeii advanced modeiii evaluationiv interpretationv, existing sales document carrying configurable items, - constraints- procedures- actions- selection conditions- preconditionsthe tool, menu -> system -> utilities -> runtime analysis -> switch, avoid unnecessary side effects leading, - va02- va03- va22- va23- cu50b
Related Notes : 
       
| 1023995 | CUTRC writes no entries in the BAPI/IDOC at termination | 
| 917987 | General performance in variant configuration | 
| 69455 | Servicetools for Applications ST-A/PI (ST14, RTCCTOOL, ST12) |