Difference between prefer-application-packages in weblogic.xml and weblogic-application.xml?

Hi!
When deploying a WAR to WebLogic 10.3.5, what is the difference between the prefer-application-packages element in the files weblogic.xml and weblogic-application.xml?
In my WARs WEB-INF/lib/ I have a JAR that contains classes that are already provided by the container (but older versions).
If I do not use prefer-application-packages then my app gets the classes provided by the container.
If I use prefer-application-packages in weblogic.xml then I get the classes from WAR/WEB-INF/lib which is expected.
But if I use prefer-application-packages in weblogic-application.xml then I get the container versions. Why?
Is there a difference between those two options?
The exact data I use is:
(foo.bar.* is the conflicting package; I add or remove the linex marked with XXXX)
WEB-INF/weblogic.xml :
<?xml version="1.0" encoding="UTF-8"?>
<wls:weblogic-web-app
    xmlns:wls="http://xmlns.oracle.com/weblogic/weblogic-web-app"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd http://xmlns.oracle.com/weblogic/weblogic-web-app http://xmlns.oracle.com/weblogic/weblogic-web-app/1.2/weblogic-web-app.xsd">
    <wls:container-descriptor>
        <wls:show-archived-real-path-enabled>true</wls:show-archived-real-path-enabled>
        <wls:prefer-application-packages> 
            <wls:package-name>foo.bar.*</wls:package-name> 
        </wls:prefer-application-packages> 
        <wls:prefer-application-resources>
            <wls:resource-name>META-INF/services/some....</wls:resource-name>
            <wls:resource-name>META-INF/services/unrelated...</wls:resource-name>
            <wls:resource-name>META-INF/services/stuff...</wls:resource-name>
        </wls:prefer-application-resources>
    </wls:container-descriptor>
    <wls:jsp-descriptor>
        <wls:page-check-seconds>-1</wls:page-check-seconds>
        <wls:precompile>true</wls:precompile>
        <wls:precompile-continue>true</wls:precompile-continue>
        <wls:keepgenerated>true</wls:keepgenerated>
    </wls:jsp-descriptor>
    <wls:session-descriptor>
        <wls:persistent-store-type>replicated_if_clustered</wls:persistent-store-type>
    </wls:session-descriptor>
</wls:weblogic-web-app>
META-INF/weblogic-application.xml :
<?xml version="1.0" encoding="UTF-8"?>
<weblogic-application
    xmlns="http://xmlns.oracle.com/weblogic/weblogic-application"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/javaee_5.xsd http://xmlns.oracle.com/weblogic/weblogic-application http://xmlns.oracle.com/weblogic/weblogic-application/1.2/weblogic-application.xsd">
    <application-param>
        <param-name>webapp.encoding.default</param-name>
        <param-value>UTF-8</param-value>
    </application-param>
    <xml>
        <parser-factory>
            <saxparser-factory>
                org.apache.xerces.jaxp.SAXParserFactoryImpl
            </saxparser-factory>
            <document-builder-factory>
                org.apache.xerces.jaxp.DocumentBuilderFactoryImpl
            </document-builder-factory>
            <transformer-factory>
                org.apache.xalan.processor.TransformerFactoryImpl
            </transformer-factory>
        </parser-factory>
    </xml>
    <prefer-application-packages>
        <package-name>foo.bar.*</package-name> 
        <package-name>javax.jws.*</package-name>
        <package-name>javax.xml.ws.*</package-name>
        <package-name>org.apache.cxf.*</package-name>
        <package-name>antlr.*</package-name>
        <package-name>org.xmlsoap.schemas.wsdl.*</package-name>
    </prefer-application-packages>
</weblogic-application>

weblogic-application.xml has no meaning in WARs, it is only used in EARs.

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