The Enterprise version is limited by the number of agents, in case you exceed the number of agents of the license an error message will appear.
To delete the excess agents the only thing to do is to disable the Enterprise function and with Open delete the excess agents.
We can do this by renaming the Enterprise folder, in the case of a CentOS Appliance it would be like this:
mv /var/www/html/pandora_console/enterprise /var/www/html/pandora_console/enterprise.bk