Solution : https://service.sap.com/sap/support/notes/830263 (SAP Service marketplace login required)
Key words :
/usr/sap/<instance id>/jc<instance number>/j2ee/support_platform/plugins/, sr1 migration - support platform plugins, support platform plugins, sr1 portal migration, sapinst migration tool, symptom ep6 sp2, plug-ins reason, prerequisites ep6 sp2, lower lower target, sap note 812688
Related Notes :
| 836768 | Initial Troubleshooting for Portal SP2 to SR migartion |
| 812688 | Central Note - Support Platform for NW04. |
| 732458 | Central Note - Migration Enterprise Portal 6.0 SP2 to NW '04 |