Solution : https://service.sap.com/sap/support/notes/720537 (SAP Service marketplace login required)
Key words :
local currency amount, incorrect exchange rate, relevant support package, call transaction se24, instance attribute a_evt_flowcurrency_check, instance event evt_flowcurrency_check, assign alias set_fieldmod, method if_ftr_gui_appl~set_fieldmod, assign alias set_msg, method if_ftr_gui_appl~set_msg
Related Notes :
| 37900 | DS138: "Changes prohibited by user" |