Solution : https://service.sap.com/sap/support/notes/898978 (SAP Service marketplace login required)
Key words : 
end        days  weeks    month     year25-04-1999        14-08-1999  112  16, end        days weeks    month year01-02-2004       31-01-2005  366  52, dd-mm-yyyy, prerequisites program error, sap service marketplace, year values returned, terms pricing engine, wrong month, wrong year, ipc-pricing
Related Notes : 
       
| 950530 | Wrong year value from pricing. | 
| 486061 | How to get patches for CRM Internet Pricing Configurator |