support for "at most once" delivery?

This might well be a bug on documentation or tooling, but RM seems the best
place to start. I tried implementing Nick's use case 1.7.4 which calls for "at
most once" message delivery semantics. Does our RM implementation support that?
If it is doing that by default, we should document it in the tutorial. If it
requires setting policy assertion, the NetBeans plugin would need to be made
aware of it.
#### Environment
Operating System: Windows XP
Platform: Other
#### Affected Versions
[current]

Source: [https://github.com/javaee/metro-wsit/issues/570](https://github.com/javaee/metro-wsit/issues/570)
Author: glassfishrobot

Start by reviewing the RM implementation and the tutorial to determine whether "at most once" delivery is already supported by default. If a policy assertion is required, inspect the NetBeans plugin as well; done means documenting the behavior or updating the plugin, but the issue does not identify specific files or tests.

Written by the indexing model from the issue text.