Solution : https://service.sap.com/sap/support/notes/1298098 (SAP Service marketplace login required)
Key words :
goto planning book / data view design mode, <hide key figure> function, hide key figures, planning book, xml header declaration, remove key figures, terms character encoding, graphic mode, key figures, character encoding
Related Notes :
| 1017101 | Encoding Problems with ABAP XML Processing |