HowTo get WTPart Information during Promotion Review

Hi Guys,

I am completely new at customization and inquisitive for knowledge Thank you for your help in Advance !

i wanted to send the number/name of the Part in the Header of the Review PR Task Mail during the Promotion Notice (Workflow).

For that i created the Variables PR_Description, Part_Number, Part_Name in the Workflow Properties/Variables and added the following code to the first conditional.

wt.maturity.PromotionNotice pn = (wt.maturity.PromotionNotice)primaryBusinessObject;

wt.part.WTPart prt = (wt.part.WTPart)primaryBusinessObject;

PR_Description = ext.testpackage.Promotionhelper.get_pn_desc(pn);

Part_Number = ext.testpackage.Promotionhelper.get_part_number(prt);

Part_Name = ext.testpackage.Promotionhelper.get_part_name(prt);

The created class includes the following:

package ext.testpackage;

import wt.maturity.PromotionNotice;

import wt.part.WTPart;

public class Promotionhelper {

    public static void main(String args[]) {

        System.out.println("test");

    }

public static String get_pn_desc (PromotionNotice pn) {

            return pn.getDescription();

    }

public static String get_part_number (WTPart prt) {

            return prt.getNumber();

    }              

public static String get_part_name (WTPart prt) {

            return prt.getName();

    }

The PR_Description works perfectly. It got the mail with the Description, but for PartName and PartNumber i got the following:

Mo 6/3/13 14:02:05: WfPropagationQueue.PollingThread: Caused by: java.lang.ClassCastException: wt.maturity.PromotionNotice cannot be cast to wt.part.WTPart

Mo 6/3/13 14:02:05: WfPropagationQueue.PollingThread:     at wt.workflow.expr.WfExpression39493.execute_ROUTER_EXPRESSION_(WfExpression39493.java:40)

Mo 6/3/13 14:02:05: WfPropagationQueue.PollingThread:     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

Mo 6/3/13 14:02:05: WfPropagationQueue.PollingThread:     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

Mo 6/3/13 14:02:05: WfPropagationQueue.PollingThread:     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

Mo 6/3/13 14:02:05: WfPropagationQueue.PollingThread:     at java.lang.reflect.Method.invoke(Method.java:597)

Mo 6/3/13 14:02:05: WfPropagationQueue.PollingThread:     at wt.workflow.definer.WfExpression.executeRouter(WfExpression.java:2715)

Mo 6/3/13 14:02:05: WfPropagationQueue.PollingThread:     ... 15 more

Do you have any clue how i can get the PartName and PartNumber for the Object in Promotion Notice?