Solution : https://service.sap.com/sap/support/notes/397252 (SAP Service marketplace login required)
Key words :
creating message types whsord, convert masked special characters, basis type delvryxx, special characters, masked internally, text segments, sapscript format, text segments & <, terms delvry01, itf-format
Related Notes :
| 399124 | INVOIC: < (>&<(><) ><)>, < (> < <) >, < (> > <(><) ><)> in I |
| 397853 | DESADV01: Special character '&' '<' '>' is not in ASCII |
| 391642 | ORDRSP: < (>&<(><) ><)>, < (> < <) >, < (> > <(><) ><)> in t |