Solution : https://service.sap.com/sap/support/notes/780775 (SAP Service marketplace login required)
Key words : 
terms afvgd-ltxa1, caufvd-ktext reason, processing short texts, long texts, order header, service orders, bapi bapi_alm_order_maintain, errors occur, program error, solution implement
Related Notes : 
       
| 781140 | Error message TD604 in BAPI_ALM_ORDER_MAINTAIN | 
| 780743 | BAPI: Operation short text is not transferred | 
| 779872 | BAPI: Problems in long text processing for operation | 
| 778602 | BAPI: 1. line long text not transferred completely | 
| 772580 | BAPI: Changing short text does not change long text | 
| 771445 | BAPI: Incorrect long text processing | 
| 708508 | Downgrade BAPI_ALM_ORDER_MAINTAIN -> errors |