Solution : https://service.sap.com/sap/support/notes/449330 (SAP Service marketplace login required)
Key words : 
system data field -> sap installation number, sap support desk system, terms support line feedback, incorrect installation number, correct installation number, correct s-user, ==> enter support message, key appli = tst_cus, field appli, ssm system
Related Notes : 
       
| 614311 | FAQ: Support notifications | 
| 437287 | Enter support message, create message from Solution Manager | 
| 388814 | Extending the feedback functions |