Solution : https://service.sap.com/sap/support/notes/606576 (SAP Service marketplace login required)
Key words : 
support package versions 10-14, header condition screen, terms upper limit, support package 15, header condition, upper limit, condition rate, lower limit, system checks, program error
Related Notes : 
       
| 867309 | |
| 793801 | Upper/lower limits: NullPointerException | 
| 758250 | |
| 563326 | SELECT the Upper/Lower Limits of Condition Records from DB | 
| 530835 | IPC Support Packages for CRM 3.0, CRM 3.1 and CRM 4.0 | 
| 504111 | Lower/upper limits for condition rate not taken into account | 
| 486061 | How to get patches for CRM Internet Pricing Configurator |