Solution : https://service.sap.com/sap/support/notes/435735 (SAP Service marketplace login required)
Key words : 
additional key words sapscript, sapscript pc editor, sapscript line editor, -iso-latin1 languages, asian character sets, internal itf line, asian multibyte languages, asian languages, line break, text editor
Related Notes : 
       
| 578087 | Smart Forms: mojibake in PC Editor for text with line break | 
| 103279 | SAPscript: PC Editor in different languages |