CMMVC9631E The command failed because last IP address in the host-attach portset is linked with the host object.

Explanation
The last IP (IPv4 or IPv6) address in a host-attach portset cannot be removed when it is linked
with the host object.

User response
To delete the IP address, either use rmhost command to delete a host object or
use chhost command to move the host object to another host-attach portset.