Solution : https://service.sap.com/sap/support/notes/771989 (SAP Service marketplace login required)
Key words : 
ipc pme - release 4, current ipc patch, selected product, model tree, delete key, deleted correctly, keyboard reason, sp07 solution, prerequisites installation, standard installation
Related Notes : 
       
| 486061 | How to get patches for CRM Internet Pricing Configurator |