Solution : https://service.sap.com/sap/support/notes/1051524 (SAP Service marketplace login required)
Key words :
content administrator -> portal content -> search tabexecute, 'property editor - universal worklist & workflow' area, finding 'universal worklist & workflow' workset, select 'universal worklist & workflow' workset, /sp-stacks -> sp stack schedule, kmc-cm kmc sap netweaver 7, folder 'universal worklist & workflow', 'universal worklist - administration' page, terms km portal content, set 'merge id' property
Related Notes :
| 987865 | KMC NW04 SPS20 / KMC SAP NetWeaver 7.0 SP12 |