SIM 6.3 discovers component with IP associated while it hasn't an IP address

[Tinux]

Situation:

C7000 with 2 OA's.

Both OA's where configured with an IP adres and discoverd in HP SIM.

Now the enclosure is set Enclosure IP mode and the passive OA is set to DHCP.

Deleted the Enclosure, OA's, Blades and all associations from SIM and run disover job on the Enclosure IP address of the active OA .

The passive OA still appears in SIM with it's "old" ip address.

Who, what where is that "old" ip address stored or discovered ?

Regards,

Martijn