Solution : https://service.sap.com/sap/support/notes/140837 (SAP Service marketplace login required)
Key words : 
repetitive manufacturing planning table, global settings > check units, additional key words mf50, customizing 0 decimal places, transaction mf50, decimal places, editing functions, daily rate, prerequisites precondition, editing function
Related Notes : 
       
| 137543 | Mf50: Rounding problems when changng unit o.measure | 
| 115871 | MF50: Rounding error |