Solution : https://service.sap.com/sap/support/notes/408681 (SAP Service marketplace login required)
Key words : 
error message fi057 'system error, ps-cash management, funds management update, problem unnecessarily difficult, source code corrections, system error, terms fi057, error situations, program error, source document
Related Notes : 
       
| 495319 | (MM) MIR4: Invoice reduction with parked document | 
| 485236 | (SD) FI057 with 'Buzei in LFMPRF04' | 
| 423497 | Error message FI057 w/ posting using Transaction AB08 | 
| 379173 | (MM) Log. invoice ver.: FI057 with change from MIRO to MIR7 | 
| 379125 | FV60: FI057 "System error:..." in FI Enjoy parking | 
| 378178 | (FI) Changing parked document as regards posting year | 
| 359701 | (FI+MM) Parking invoice or its deletion | 
| 316573 | (SD) Tax for invoice cancellation after down paymnt clearing | 
| 311834 | FI-SL: BUZEI incorrect with BSEG-BUZEI | 
| 303784 | (SD) Tax for down payment clearing (3) | 
| 184276 | (SD) Tax for down payment clearing (2) | 
| 166372 | (SD) Tax for down payment clearing | 
| 123905 | (FI) Down payment clearing: incorrect commitment item/FI057 | 
| 36353 | AC interface: Summarizing FI documents |