Solution : https://service.sap.com/sap/support/notes/574775 (SAP Service marketplace login required)
Key words : 
ipc handles items differently, deleting items, external number, item conditions, terms guid, externalid reason, item guids, service pack 14, advance patch, software center
Related Notes : 
       
| 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 |