Solution : https://service.sap.com/sap/support/notes/922163 (SAP Service marketplace login required)
Key words : 
warning message ks096 appears, change transaction ks02, warning message ksa096, warning message, error message, cost center, system issues, profit center, standard system, terms ks 096
Related Notes : 
       
| 957452 | KSH2: Checks for saving in COOMKS02 | 
| 880539 | No warning message when create cost center w/o profit center | 
| 757143 | OKEON: Error message KS 096 is set as an error | 
| 486781 | Making KS096 adjustable |