Using PWS in version 7.15.0, I execute a Job that contains the following simple Groovy task script:
import org.objectweb.proactive.api.PAVersion;
println PAVersion.getProActiveVersion();
The script displays _ $Id$_ as version number. It should output 7.15.0 since PWS includes ProActive Programming in the same version.
The value $Id$ seems to be a legacy of SVN.