Solution : https://service.sap.com/sap/support/notes/603636 (SAP Service marketplace login required)
Key words :
rtf conversion reason, parameter formatwidth set, rtf conversion, blank characters, implement note 575346, standard texts, blank character, blank space, format column, tdformat=space
Related Notes :
| 670254 | FORMAT_TEXTLINES: Missing blank space with long lines |
| 575346 | Change to FORMAT_TEXTLINES for Asian languages |