Solution : https://service.sap.com/sap/support/notes/530494 (SAP Service marketplace login required)
Key words : 
system creates subitems, internet pricing configurator, multi-level configuration, prior support package, support package 11, support package 8, subsequent pricing, pricing reason, superior item, source code
Related Notes : 
       
| 486061 | How to get patches for CRM Internet Pricing Configurator |