Solution : https://service.sap.com/sap/support/notes/725201 (SAP Service marketplace login required)
Key words : 
project pricinguserexits itemuserexit documentuserexitproductengineuserexit reason, sap service marketplace, ipc user exits, eclipse project, ipc release 4, internet pricing, 0 support package 05, 0 support package 06, 0 support packages 03-05, prerequisites
Related Notes : 
       
| 486061 | How to get patches for CRM Internet Pricing Configurator |