Solution : https://service.sap.com/sap/support/notes/725202 (SAP Service marketplace login required)
Key words : 
screen group 10 select 'modified fields' choose 'change' confirm, transaction sfaw enter module pool sapliqs0, viqmel-revnr            attribute 'cust' activated save, influence field viqmel-revnr, viqmel-revnr reason, field viqmel-revnr, prerequisites causethe problem, prerequisiteplm extension set 2, dialog box create, solution create
Related Notes : 
       
| 829094 | PM/CS notifications with inconsistent Data | 
| 828901 | Revision number in notification lists cannot be displayed | 
| 731307 |