Solution : https://service.sap.com/sap/support/notes/397853 (SAP Service marketplace login required)
Key words :
message category desadv, base type desadv01, blanketted special characters, special characters, terms desadv01, text segments, format sapscript, character display, text segments & <, itf format
Related Notes :
| 535452 | ORDERS: &, <, > in text segments |
| 399124 | INVOIC: < (>&<(><) ><)>, < (> < <) >, < (> > <(><) ><)> in I |
| 397252 | DELIVERY: special characters '&' '<' '>' not in ASCII |
| 391642 | ORDRSP: < (>&<(><) ><)>, < (> < <) >, < (> > <(><) ><)> in t |