Solution : https://service.sap.com/sap/support/notes/368239 (SAP Service marketplace login required)
Key words : 
additional key words support package 4, japanese ms office installations, - ms office word permanently, ms word security settings, ms word macros, sap root certificate, execute unsigned macros, symptom affected functions, 1on-line editing, security level
Related Notes : 
       
| 369228 | Problems when printing structures | 
| 368963 | Use signed macros in Knowledge Warehouse | 
| 368861 | KW and security levels under MS Office | 
| 366597 | SAP KW 5.1 Installation Asia | 
| 312243 | Office 2000 support and macro virus warnings |