Solution : https://service.sap.com/sap/support/notes/570051 (SAP Service marketplace login required)
Key words :
ignoring conversion errors addition, ignoring conversion errors, multibyte code page, system code page, target code page, truncated multibyte character, multibyte characters reason, truncated multibyte characters, terms conversion error, errors detected
Related Notes :
| 1563857 | Runtime error CONVT_CODEPAGE CX_SY_CONVERSION_CODEPAGE |
| 27 | Recommendations for the ABAP file interface |