Solution : https://service.sap.com/sap/support/notes/517475 (SAP Service marketplace login required)
Key words : 
batch lobm_vfdat shelf life/expiry date lobm_qndat, lobm_udcode usage decision lobm_qscore qualityscore usage decision, affects user-defined reference characteristics, batch lobm_hsdat production date, user-defined characteristics, batch               inconsistencies occur, batch master record, standard characteristics delivered, usage decision, /3 support packages sapkh31i84
Related Notes : 
       
| 518906 | Revaluation of characteristics LOBM_QSCORE and LOBM_UDCODE | 
| 517121 | QA11 : Reference characteristics of batch not classified | 
| 517038 | Newly created characteristic value assignments not saved | 
| 516143 | Classification for EXIT_SAPMM07M_004 disappears | 
| 483543 | QA11: Reference characteristics of batch are not classified | 
| 421975 | CL30N: Search w/ reference characteristics finds no objects | 
| 418242 | CLAP_DDB_UPDATE_CLASSIFICATION f. charact.val.assignm.(CLO0) |