I have Template_File_System template (see attached Template_File_System.xml) for monitoring a bunch of vfs.fs.size[] and vfs.fs.inode[] items and I imported it into another Zabbix installation. I linked it to Template_Unix, which was already linked to a bunch of hosts. If I now go to one of the hosts, select item with key "vfs.fs.size[{$VFS_FS_ROOT},total]" and press "Clone", I get "Warning. Field [formula] is not double" (see formula-warning.png). The "Clone" operation works for some of the items from that template, but does not work for others.