Solution : https://service.sap.com/sap/support/notes/101899 (SAP Service marketplace login required)
Key words : 
additional key words restrictable, solution apply note 91647, restrictable characteristic, allowed values, type 'num', assignment screen, problem occurs, advance correction, numerically restricted, restricted
Related Notes : 
       
| 142807 | Runtime error: Del. of chars which can be restrictd | 
| 139862 | Update termintion after change limitable chrctrstcs | 
| 137586 | Default values for restrictable characteristics | 
| 101816 | Release 4.5A: Double values in AUSP | 
| 91647 | 4.5A/3.1I problems w/ restrictable characteristics |