Solution : https://service.sap.com/sap/support/notes/632534 (SAP Service marketplace login required)
Key words : 
tools -> specification management -> specification database structure -> settings, master data -> master data -> generate standard phrase sets', terms ehs27bsp06dgehs27bsp06psehs31sp12dgehs31sp12psdangerous goodsphrase keyphrase sets reason, system generates dangerous goods phrase sets, automatic dangerous goods phrase set generation, -> dangerous goods management -> basic data, master data              automatic generation, eh&s-specification management, automatic phrase set generation, phrase sets              basic data
Related Notes : 
       
| 692664 | Dangerous goods: Upgrade EH&S 2.2B to higher EH&S versions | 
| 605581 | Error in generation of default selection quantities | 
| 596462 | Corrections EH&S 2.7B: Support Package 06 | 
| 506200 | Error with assignment of dangerous goods phrase sets |