Solution : https://service.sap.com/sap/support/notes/86858 (SAP Service marketplace login required)
Key words : 
apply hot package sapkh31g11, error message c4028, additional key words, attached advance corrections, classification system, generated '+/- sign, releases >= release 3, prerequisites solution, characteristic, restriction
Related Notes : 
       
| 111841 | Known deficiencies in EH&S 2.2B | 
| 91009 | 3.1I: Value entry six-digit unit of measure with no. | 
| 74803 | |
| 71201 | 3.1G: Unit with numeric characters | 
| 65028 | 3.1G: Units of measure with blanks |