@Gerson Fabian Morales Marin There's no need to remove/re-add product instance on PLM, the warning is misleading.
It's only present on Publisher and not on Subs and was removed starting from 11.5 as part of CSCuw92104.
Also PLM guide states the occasions you need to remove/re-add product instance and this includes only change on IP address/hostname of this instance:
If the hostname or IP address of the product instance changes, you need to delete the product instance from the Cisco Prime License Manager prior to changing the hostname/IP address. You then re-add it to the Cisco Prime License Manager once you have completed the hostname/IP address change.
... View more