Solution : https://service.sap.com/sap/support/notes/810264 (SAP Service marketplace login required)
Key words : 
simple consecutive numeric values, language-dependent indicator exists, cuni maintenance transaction, start transaction cuni, purely numeric values, sap source code, customer-specific customizing, goto->translation->units, language-dependent indicators, automatic corrective measure
Related Notes : 
       
| 595742 | Transporting units of measurement | 
| 451720 | Language supplementation program for units of measure |