Solution : https://service.sap.com/sap/support/notes/188993 (SAP Service marketplace login required)
Key words :
abap command set locale language, 6b patch level 21note, correspondig short locale names, 0b patch level 578 4, 5b patch level 306 4, long locale names, runtime error textenv_invalid, iso-8859-1available locale, locale names, wrong locale
Related Notes :
| 187864 | Linux: Locale Support on Linux |
| 42781 | RABAX TEXTENV_... |
| 39473 | locale and TCP0C |