Solution : https://service.sap.com/sap/support/notes/939946 (SAP Service marketplace login required)
Key words : 
se38 -> z_fmioi_rfsys_correction_1/ z_fmioi_rfsys_correction_1 -> change -> goto -> text elements -> selection texts, symptom system fills incorrect logical system, attached program z_fmioi_rfsys_correction_1, prevent incorrect data, selection texts, selection text, correct existing tripdocuments, attached program z_fmioi_rfsys_correction_2, selecdt dictionary reffor, logical system
Related Notes : 
       
| 729063 | Double trip commitment in FM | 
| 645021 | Field FMIOI-RFSYS has incorrect values | 
| 594773 | Incorrect commitment data with change in the document chain | 
| 538329 | Correc.of incorr.business trip cmmt w/ follow-up pstng in FM |