How to run single SoapUI project from maven

Basic information is here: http://www.soapui.org/Test-Automation/maven-2x.html

larsn wrote:
when your pom has multiple projects defined.

Could you explain what you mean by this?

We run multiple soapui projects during a test execution run. In terms of the pom xml, we have multiple execution elements for the soapui-pro-maven-plugin, one for each soapui project that we run. We have tests, divided into separate soapui projects because this makes managing the tests easier.

larsn can you provide an example or extract of your pom and what you would like to do (or what you would like to pass as command line argument)?
You want to run only one project as part of the regular maven lifecycle or you want to run the project as a single task of the build?