OME - Duplicate entries (powerconnect )

HI,

Our 3 PowerConnect stacks are Discovered and inventoried as new items every day in OpenManage Essentials. 2.1.0.2635. So we have many duplicate entries

We tried to Discover and Inventory them in a group or as individual items. Same result.

All duplicates are sharing the same Ip, Mac, Service Tag and, Serial Number. How is it possible ?

Note that other devices : 13 Servers, 3 Equallogic groups (4 members) are displayed correctly.