Solution : https://service.sap.com/sap/support/notes/680228 (SAP Service marketplace login required)
Key words : 
ieee 754 double precision standard, original floating point number, floating point format, floating point numbers, symptom deviations occur, program technology point, sql standard defines, attached correction instructions, 3 rounding decimal places, recommended 15 decimal places
Related Notes : 
       
| 713606 | Rounding error upon parallel entry and exponential display | 
| 362932 | Conversion with proportion/product units |