Pandora FMS, by default, when applying a policy will put the permissions of the configuration files of the /var/spool/pandora/data_in/conf/ folder in pandora apache. If you have different permissions and you want that every time that any change is executed, you will have to go to the server configuration file /etc/pandora/pandora_server.conf and add the lines:
user X Group X
Once this change is made, restart the server /etc/init.d/pandora_server restart and any change will take into account the user and groups specified in these fields.