Solution : https://service.sap.com/sap/support/notes/366256 (SAP Service marketplace login required)
Key words : 
additional key words mc94, attached source code corrections, split period values, period split, period values, values internally, target period, planning table, rounding error, -level planning
Related Notes : 
       
| 485671 | Rounding error in planning type SOPDIS | 
| 442615 | Decimal places in flexible planning |