Solution : https://service.sap.com/sap/support/notes/825107 (SAP Service marketplace login required)
Key words : 
customer-specific user exits, comparatively long runtimes due, including support package 20, including support package 08, latest ipc patch, note significantly increases, subsequent support packages, 0 support packages 14, 0 support packages 06, ipc pricing
Related Notes : 
       
| 486061 | How to get patches for CRM Internet Pricing Configurator |