Solution : https://service.sap.com/sap/support/notes/1530174 (SAP Service marketplace login required)
Key words : 
symptom upgrade ep / epc, ep / epc 7, terms upgrade, sap netweaver 7, central note, kmc reason, prerequisites solution, related issues
Related Notes : 
       
| 1620161 | |
| 1606217 | SAP NetWeaver Portal PCD Technical Attributes Unavailable | 
| 1547149 | Indexing content might change as a result of an upgrade | 
| 1545218 | NW 730 Portal transport package might include PAR files | 
| 1535174 | Post upgrade step for AFP in NW Portal 730 and 702 | 
| 1532304 | Invalid Portal Monitors in version 7.30 were removed | 
| 1531892 | ICM session Time Out | 
| 1531306 | Central Note for NetWeaver 7.30 EP / EPC | 
| 1531137 | WebDynpro application are not loaded after Upgrade | 
| 1504296 | SAP Netweaver Portal 7.30 - Removed APIs. | 
| 1504295 | PRT SOAP APIs are no longer public | 
| 1503649 | SAP NetWeaver Portal 7.30 DCs and References | 
| 1456847 | Upgrade of Application Sharing Server 6.40 to NW 7.0x | 
| 1403832 | Central Note: Upgrade Systems on SAP NetWeaver 7.3 | 
| 1372388 | Upgrade of applications using KMC to SAP NetWeaver 7.3 | 
| 1371703 | WPC for SAP NetWeaver 7.3 - Upgrade Information | 
| 1359931 | Missing KM configurations after Update from EPC to EP UT | 
| 1143013 | Upgrading a standalone RTC 'Application Sharing Server' | 
| 1049553 | SAP Forums - Installation, Upgrade and System Copy | 
| 633002 | RTC streaming (application sharing) through a reverse proxy | 
| 337623 | Customizing after installation or upgrade |