Maven site on multi module project could not resolve dependency

I want to split my continous integration job (Hudson) into two steps. (Because the runtime with build and reporting together takes too long.) In the first job, I build my multi module maven project with "mvn package" successfully. Then I copy my workspace to another location and try to build the project again only with the goal "site" and/or findbugs/checkstyle/pmd to create reports. But this doesn't work! Maven can't resolve a dependency of my submodules. (But all JARs are available in its target folders.)

Example: My structure looks like this:

• Parent
  • A
  • B
  • C
  • D

Project C has as dependency project B.

When I build everything with "mvn site", it generates for project A and B all reports. But halted at project C with error message "Could not resolve dependencies for project B." But project B is already builded with "mvn package". I.e. I can find the JAR file of project B in its target folder.

Is there any way to resolve the dependency from submodule B without a "mvn install"? (I don't wanna do this on my ci server. I fear it could be dangerous for other jobs with the same code base.)

Update 08/20/12:

POM of root folder:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <name>Foo</name>
    <groupId>foo</groupId>
    <artifactId>bar</artifactId>
    <version>1.0</version>
    <packaging>pom</packaging>
    <modules>
        <module>parent</module>
    </modules>
</project>

Parent POM:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <name>Foo</name>
    <groupId>foo</groupId>
    <artifactId>parent</artifactId>
    <version>1.0</version>
    <packaging>pom</packaging>
    <modules>
        <module>../bar-a</module>
        <module>../bar-b</module>
        <module>../bar-c</module>
        <module>../bar-d</module>
    </modules>
    [...]
    <reporting>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>findbugs-maven-plugin</artifactId>
                <version>2.5.1</version>
                [...]
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-pmd-plugin</artifactId>
                <version>2.7.1</version>
                [...]
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-checkstyle-plugin</artifactId>
                <version>2.9.1</version>            
                [...]
            </plugin>
        </plugins>
    </reporting>
</project>

POM of B:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>foo</groupId>
        <artifactId>parent</artifactId>
        <version>1.0</version>
        <relativePath>../parent</relativePath>
    </parent>
    <name>Bar B</name>
    <artifactId>bar-b</artifactId>
    <version>1.0</version>
    <packaging>jar</packaging>  
    [...]
</project>

POM of C:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>foo</groupId>
        <artifactId>parent</artifactId>
        <version>1.0</version>
        <relativePath>../parent</relativePath>
    </parent>
    <name>Bar C</name>
    <artifactId>bar-c</artifactId>
    <packaging>jar</packaging>
    [...]
    <dependencies>
        <dependency>
            <groupId>foo</groupId>
            <artifactId>bar-b</artifactId>
            <version>1.0</version>
        </dependency>
    </dependencies>
    [...]
</project>