Solution : https://service.sap.com/sap/support/notes/742614 (SAP Service marketplace login required)
Key words :
sap enterprise portal 6, netweaver '04 sp stack 3, portal content directory, 0 sp2 patch 4 hf2, content import, 40 sp4 patch 4, cluster environment, delta-links, fail sporadically, plusor javax
Related Notes :
| 739526 | EP 6.0 SP2 Patch 4 Hotfixes |
| 588904 | EP 6.0: Central note for Portal Content Directory (PCD) |