"getValue: function(attribute, workItem, configuration) { " Function is not getting called - What could be the possible reasons? I'm using 4.0.6 RTC version

Some thoughts on this.

First of all, is this a new server? Is "Enable Process Attachment Scripts" st to true in the CCM advanced properties?
Is the script properly configured?

From the output above I can't tell if the script was called or not. What does the log show?

Another thing is that the script seems not to be semantically correct. You want to return the UUID of a contributor/user object, however the script at the end also tries to return

return Status.OK_STATUS;

which is probably code for a validation script.

I would suggest to carefully read: https://jazz.net/library/article/1093 Lab 5, https://jazz.net/wiki/bin/view/Main/AttributeCustomization , https://jazz.net/library/article/1360 and http://www.ibm.com/developerworks/rational/library/rational-team-concert-calculated-fields-work-item/

NO this is not a new server. Yes Enable Process attachment Scripts is set to True.
Yes Id's are used and the Parameter for XXXX,YYYY,ZZZZ,AAAA are passed in the Valueprovider  tag
<configuration-data final="false" id="com.ibm.team.workitem.configuration.providers" xmlns="http://com.ibm.team.workitem/providers">
                <valueProviders>
                    <valueProvider id="com.ibm.team.workitem.valueproviders.VALUE_PROVIDER._KcmqwE2MEeSGY8p-15-irw" name="RFEassignowner" providerId="com.ibm.team.workitem.shared.common.internal.valueProviders.ScriptAttributeValueProvider">
                        <script class="com.example.ValueProvider" path="/workitem/scripts/common/rfeassignowner.js"/>
                        <parameters XXXX="_PFukMOEiEd6aEPpyZ1FE5A" YYYY="_yolScUL3EeSWBczyr5sxWA" ZZZZZ="_c-aK4QpZEd-c65dvdRhmzw" AAAAAAA="_ym8Ts0L3EeSWBczyr5sxWA"/>
                    </valueProvider>
                </valueProviders>
            </configuration-data>

Note - I tried with the Fill in example feature given in Calculated value.
         Console .log given inside the getValue: function(attribute, workItem, configuration) {           did not print the value given.

ccm logs
Caused by: org.mozilla.javascript.EcmaError: TypeError: Cannot find function getvalue in object [object com.ibm.team.workitem.common.internal.scripting.WorkItemAPIType]. (rfeassignowner.js#17)
    at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3557)
    at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3535)
    at org.mozilla.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3563)
    at org.mozilla.javascript.ScriptRuntime.typeError2(ScriptRuntime.java:3582)
    at org.mozilla.javascript.ScriptRuntime.notFunctionError(ScriptRuntime.java:3646)
    at org.mozilla.javascript.ScriptRuntime.getPropFunctionAndThis(ScriptRuntime.java:2186)
    at org.mozilla.javascript.gen.c42._c2(rfeassignowner.js:17)
    at org.mozilla.javascript.gen.c42.call(rfeassignowner.js)
    at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:401)
    at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3003)
    at org.mozilla.javascript.gen.c42.call(rfeassignowner.js)
    at com.ibm.team.rtc.common.scriptengine.internal.bridge.proxy.AbstractInvocationHandler$MethodHandler$1.run(AbstractInvocationHandler.java:160)
    at com.ibm.team.rtc.common.scriptengine.environment.AbstractScriptEnvironment.execute(AbstractScriptEnvironment.java:74)
    at com.ibm.team.rtc.common.scriptengine.internal.bridge.proxy.AbstractInvocationHandler$MethodHandler.invoke(AbstractInvocationHandler.java:156)
    at com.ibm.team.rtc.common.scriptengine.internal.bridge.proxy.AbstractInvocationHandler.invokeGeneric(AbstractInvocationHandler.java:141)
    at com.ibm.team.rtc.common.scriptengine.internal.bridge.proxy.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:95)
    at com.sun.proxy.$Proxy2778.getValue(Unknown Source)
    at com.ibm.team.workitem.shared.common.internal.valueProviders.ScriptAttributeValueProvider.getValue(ScriptAttributeValueProvider.java:67)
    ... 89 more

Here the complete log from https://jazz.net/forum/questions/165177/workitem-customization-using-script-getting-uuid-from-value-provider-showing-error-in-jazz-logs
HOw to get over this error-
2014-10-08 23:12:54,335 [http-bio-9445-exec-5248 @@ 23:12 asukuma@us.ibm.com /jazz/service/com.ibm.team.workitem.common.internal.rest.IWorkItemRestService/workItem2] ERROR com.ibm.team.workitem.common                        - Error invoking value provider 'com.ibm.team.workitem.valueproviders.VALUE_PROVIDER._DJv4sE9vEeSGY8p-15-irw'
com.ibm.team.repository.common.TeamRepositoryException: Unexpected exception type
at com.ibm.team.workitem.shared.common.internal.valueProviders.ScriptAttributeValueProvider.handleException(ScriptAttributeValueProvider.java:281)
at com.ibm.team.workitem.shared.common.internal.valueProviders.ScriptAttributeValueProvider.getValue(ScriptAttributeValueProvider.java:69)
at com.ibm.team.workitem.common.internal.attributeValueProviders.AttributeValueProviderRegistry$SafeValueProvider.getValue(AttributeValueProviderRegistry.java:42)
at com.ibm.team.workitem.common.internal.model.impl.AttributeImpl.getValue(AttributeImpl.java:899)
at com.ibm.team.workitem.service.internal.save.DependentValueUpdater.handleNotifySave(DependentValueUpdater.java:40)
at com.ibm.team.workitem.service.internal.save.WorkItemSaveParticipant.handleNotifySave(WorkItemSaveParticipant.java:32)
at com.ibm.team.workitem.service.internal.save.WorkItemSavePreparation.notifySave(WorkItemSavePreparation.java:205)
at com.ibm.team.workitem.service.internal.WorkItemRepositoryService.notifyPreSave(WorkItemRepositoryService.java:470)
at com.ibm.team.workitem.service.internal.WorkItemRepositoryService.access$3(WorkItemRepositoryService.java:464)
at com.ibm.team.workitem.service.internal.WorkItemRepositoryService$1.run(WorkItemRepositoryService.java:354)
at com.ibm.team.workitem.service.internal.WorkItemRepositoryService$1.run(WorkItemRepositoryService.java:1)
at com.ibm.team.repository.service.internal.PrimitiveTransactionService$3.run(PrimitiveTransactionService.java:163)
at com.ibm.team.repository.service.internal.rdb.RepositoryDatabase$Transaction.run(RepositoryDatabase.java:496)
at com.ibm.team.repository.service.internal.rdb.RepositoryDatabase$1.run(RepositoryDatabase.java:320)
at com.ibm.team.repository.service.internal.rdb.ConnectionPoolService.withCurrentConnection(ConnectionPoolService.java:448)
at sun.reflect.GeneratedMethodAccessor46.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56)
at com.sun.proxy.$Proxy87.withCurrentConnection(Unknown Source)
at com.ibm.team.repository.service.internal.rdb.RepositoryDatabase.runTransaction(RepositoryDatabase.java:316)
at com.ibm.team.repository.service.internal.rdb.RepositoryDatabase.runInTransaction(RepositoryDatabase.java:271)
at com.ibm.team.repository.service.internal.PrimitiveTransactionService.runInTransaction(PrimitiveTransactionService.java:96)
at com.ibm.team.repository.service.internal.PrimitiveTransactionService.runInTransaction(PrimitiveTransactionService.java:91)
at sun.reflect.GeneratedMethodAccessor141.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56)
at com.sun.proxy.$Proxy124.runInTransaction(Unknown Source)
at com.ibm.team.repository.service.AbstractService.runInTransaction(AbstractService.java:967)
at com.ibm.team.workitem.service.internal.WorkItemRepositoryService.saveTransaction(WorkItemRepositoryService.java:341)
at com.ibm.team.workitem.service.internal.WorkItemRepositoryService.save(WorkItemRepositoryService.java:296)
at sun.reflect.GeneratedMethodAccessor494.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56)
at com.sun.proxy.$Proxy613.save(Unknown Source)
at com.ibm.team.workitem.service.internal.WorkItemServer.save(WorkItemServer.java:302)
at com.ibm.team.workitem.service.internal.WorkItemServer.saveWorkItems(WorkItemServer.java:151)
at com.ibm.team.workitem.service.internal.rest.WorkItemRestService.postWorkItem2(WorkItemRestService.java:482)
at sun.reflect.GeneratedMethodAccessor660.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56)
at com.sun.proxy.$Proxy630.postWorkItem2(Unknown Source)
at sun.reflect.GeneratedMethodAccessor659.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at com.ibm.team.repository.servlet.AbstractTeamServerServlet.doModelledRestService(AbstractTeamServerServlet.java:530)
at com.ibm.team.repository.servlet.AbstractTeamServerServlet.handleRequest2(AbstractTeamServerServlet.java:2359)
at com.ibm.team.repository.servlet.AbstractTeamServerServlet.handleRequest(AbstractTeamServerServlet.java:2153)
at com.ibm.team.repository.servlet.AbstractTeamServerServlet.service(AbstractTeamServerServlet.java:1963)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.eclipse.equinox.http.registry.internal.ServletManager$ServletWrapper.service(ServletManager.java:180)
at org.eclipse.equinox.http.servlet.internal.ServletRegistration.service(ServletRegistration.java:61)
at org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:126)
at org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:76)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.eclipse.equinox.servletbridge.BridgeServlet.service(BridgeServlet.java:120)
at com.ibm.team.repository.server.servletbridge.JazzServlet.service(JazzServlet.java:74)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.ibm.team.repository.server.servletbridge.BridgeFilter.processDelegate(BridgeFilter.java:165)
at com.ibm.team.repository.server.servletbridge.BridgeFilter.doFilter(BridgeFilter.java:198)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:581)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:336)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:761)
Caused by: org.mozilla.javascript.EcmaError: TypeError: Cannot find function getvalue in object [object com.ibm.team.workitem.common.internal.scripting.WorkItemAPIType]. (rfeassignowner.js#18)
at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3557)
at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3535)
at org.mozilla.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3563)
at org.mozilla.javascript.ScriptRuntime.typeError2(ScriptRuntime.java:3582)
at org.mozilla.javascript.ScriptRuntime.notFunctionError(ScriptRuntime.java:3646)
at org.mozilla.javascript.ScriptRuntime.getPropFunctionAndThis(ScriptRuntime.java:2186)
at org.mozilla.javascript.gen.c53._c2(rfeassignowner.js:18)
at org.mozilla.javascript.gen.c53.call(rfeassignowner.js)
at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:401)
at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3003)
at org.mozilla.javascript.gen.c53.call(rfeassignowner.js)
at com.ibm.team.rtc.common.scriptengine.internal.bridge.proxy.AbstractInvocationHandler$MethodHandler$1.run(AbstractInvocationHandler.java:160)
at com.ibm.team.rtc.common.scriptengine.environment.AbstractScriptEnvironment.execute(AbstractScriptEnvironment.java:74)
at com.ibm.team.rtc.common.scriptengine.internal.bridge.proxy.AbstractInvocationHandler$MethodHandler.invoke(AbstractInvocationHandler.java:156)
at com.ibm.team.rtc.common.scriptengine.internal.bridge.proxy.AbstractInvocationHandler.invokeGeneric(AbstractInvocationHandler.java:141)
at com.ibm.team.rtc.common.scriptengine.internal.bridge.proxy.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:95)
at com.sun.proxy.$Proxy1136.getValue(Unknown Source)
at com.ibm.team.workitem.shared.common.internal.valueProviders.ScriptAttributeValueProvider.getValue(ScriptAttributeValueProvider.java:67)
... 88 more

I took the time to look into this. The script is syntactical incorrect for various reasons. I am unsure why this should have ever run.
I reconstructed the script from a valid example provided by RTC.

First observation: the line

            var component = workItem.getvalue(WorkItemAttributes.rfeComponent);

is and has never been a valid statement. There is no WorkItemAttributes.rfeComponent defined in RTc and there probably never was. This should be the string representation of the attribute to be read. E.g. "my.attrib.rfecomponent". This line causes the error above.

Second observation: the line below, as already mentioned but ignored, is bogus. This line should not be there. The script has to return a contributor or maybe null, but not a status. Status is returned in validations.

    else    {
        return Status.OK_STATUS;
    }

My suggestion:

1. Read https://jazz.net/library/article/1093 Lab 5, https://jazz.net/wiki/bin/view/Main/AttributeCustomization , https://jazz.net/library/article/1360 and http://www.ibm.com/developerworks/rational/library/rational-team-concert-calculated-fields-work-item/. Really at least go through the workshop.
2. Back up the script in an external file
3. Replace the content with a valid calculated value provider example, or the seed below.
   
4. Put the lines in the function body back in one by one and make sure the script runs every time. Use the Eclipse client to do so and open the .metadata/.log file with an editor like notepad++ and check that the script does not fail
5. Fix the last else statement and return a sensible default.
   

Seed:

/*******************************************************************************
 * Licensed Materials - Property of IBM
 * (c) Copyright IBM Corporation 2011. All Rights Reserved.
 *
 * Note to U.S. Government Users Restricted Rights:  
 * Use, duplication or disclosure restricted by GSA ADP Schedule 
 * Contract with IBM Corp. 
 *******************************************************************************/
dojo.provide("com.example.ValueProvider");
dojo.require("com.ibm.team.workitem.api.common.WorkItemAttributes");

(function() {
	var WorkItemAttributes = com.ibm.team.workitem.api.common.WorkItemAttributes;
    dojo.declare("com.example.ValueProvider", null, {

        getValue: function(attribute, workItem, configuration) {
        
			return workItem.getValue(WorkItemAttributes.OWNER);
        }
    });
})();

I tried with the suggestions provided,
When I use Component a Custom enumeration field, it breaks.   Is there a way to compare Custom enumeration field with other RTC provided value ?  Can we hard code that in this feature.

In Chrome - Development Tool I see the below error
Problems executing value provider for {0}: undefined is not a function. TypeError: undefined is not a function
   at dojo.declare.getValue (rfeassignowner.js:23:36)

JS-
dojo.provide("com.example.setownerbycomponent");
dojo.require("com.ibm.team.workitem.api.common.WorkItemAttributes");

(function() {
var WorkItemAttributes = com.ibm.team.workitem.api.common.WorkItemAttributes;
    dojo.declare("com.example.setownerbycomponent", null, {

        getValue: function(attributeId, workItem, configuration) {
       
          var type = workItem.getValue(WorkItemAttributes.TYPE);
          var state = workItem.getValue(WorkItemAttributes.STATE);
          var component = workItem.getvalue(WorkItemAttributes.rfeComponent);
              
            if (workItem.getValue(WorkItemAttributes.TYPE) === "rfe" && workItem.getValue(WorkItemAttributes.STATE) === "rfeWorkflow.state.s1" && workItem.getvalue(WorkItemAttributes.rfeComponent) === "rfeComponent.literal.l9"){
return configuration.getChild("parameters").getStringDefault("XXXXXX", "");
}
                      
          else { 
          console.log("output test");
      return workItem.getValue(WorkItemAttributes.OWNER);
}
          }
    });
})();