clustering-impl doesn't set a version but refers to it by ${project.version}

[WARNING] Some problems were encountered while building the effective model for org.jboss.as:jboss-as-clustering-impl:jar:7.1.0.Final-SNAPSHOT
[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: org.jboss.as:jboss-as-clustering-common:jar -> version (?) vs ${project.version} @ line 53, column 21

        <dependency>
            <groupId>org.jboss.as</groupId>
            <artifactId>jboss-as-clustering-common</artifactId>
            <version>${project.version}</version>
        </dependency>