[Setting data source attributes generates error "Attribute 'host' is not defined in the User Profile"]

I followed the Admin guide and tested with a new user on JRS 6.4.0 and JRS 7.5.0 and I get the same error :

"Attribute 'host' is not defined in the User Profile."

Or if the host is defined in the Server profile :

"Attribute 'host' is not defined in the server Profile."

Here is the URL : jdbc:postgresql://{attribute('host','Server')}:{attribute('port','Server')}/{attribute('db','Server')}

If anyone has an idea...