Solution : https://service.sap.com/sap/support/notes/79308 (SAP Service marketplace login required)
Key words : 
warning message additional key words, apply hot package sapkh31g09, identical classification solution change, form routine check_classification, prerequisites multiple classification, warning message, identical classification, checkerror message, multiple classification, behave correctly
Related Notes : 
       
| 214562 | Check for same classification | 
| 83534 | Inconsistency message for multiple classification | 
| 83531 | Check same classification |