Is it possible to have more than one filesystem of the same type for a domain?

Yes, but only if the filesystem type is "others".

Otherwise it is NOT allowed to have more than one filesystem of the same type for a domain node.

E.g.: Two filesystems of the type "ASSETS" are not allowed to be configured for the domain "root.".

Nevertheless you may use the filesystem type "ASSETS" in a sub domain like "root.anysubdomain." even when already configured for "root.".

Note: If your censhare system is not on the latest bugfix version, the censhare-Admin Client may not avoid such a misconfiguration.