Solution : https://service.sap.com/sap/support/notes/793801 (SAP Service marketplace login required)
Key words : 
calculation type 'g', software distribution center, lower limit reason, 0 support package levels 4-8, 0 support package 9, 0 support package 21, upper limit, lower limits, condition record, nullpointerexception occurs
Related Notes : 
       
| 867309 | |
| 743710 | |
| 606576 | Upper/lower limits for header conditions | 
| 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 | 
| 486061 | How to get patches for CRM Internet Pricing Configurator |