Solution : https://service.sap.com/sap/support/notes/795600 (SAP Service marketplace login required)
Key words : 
i_xerrorlog      type          boole-boole, transaction 'display invoice document', completely parked invoice document, start transaction se37, status indicator line, optional import parameter, mrm_drseg_check function module, 'mrm_drseg_check' function module, tab page 'import', display existing error
Related Notes : 
       
| 527626 | MIR4/MR2M: Display of warning and error messages | 
| 497123 | MIR4, MIR7: Error messages in the parking | 
| 455859 | MIRO: No display of warning or information messages |