Description of problem:
The same option (attribute or metadata) can be added multiple times.
There is no input validation in the editor.
For attributes requiring a date, there should be a calendar pop-up to help choose a date.
Dialect should be a select box with only the supported values available.

See screenshot.

If you don't enter a string with whitespaces into salience input, validation then fails quietly on the data from the screenshot. There is an error in the server log stating that:
org.jboss.errai.bus.client.api.base.MessageDeliveryFailure: error invoking endpoint
Caused by: org.guvnor.common.services.shared.exceptions.GenericPortableException: Invalid date input format: [or a bit later] it should follow: [dd-MMM-yyyy]

If you don't have access to server log, you will never know that there is something wrong.

Version-Release number of selected component (if applicable):
6.0 ER1