Unable to find Application Module (AM)and OAF HeaderBean Region in Selfservice OAF Page.

 Hi,
We try to extent controller “SitUpdateCO “of OAF Selfservice’s (Transport Reimbursement: Special Information) Page. But we are facing a problem when we try to find AM. findApplicationModule return null value in controller. Kindly review below code / attached file for further detail. And kindly solve my problem.

My Controller Code:
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package xxuepco.oracle.apps.per.selfservice.specialinformation.webui;

import oracle.apps.fnd.common.VersionInfo;
import oracle.apps.fnd.framework.OAApplicationModule;
import oracle.apps.fnd.framework.OAException;
.......

public class XXUEPESitUpdateCO extends SitUpdateCO {
public XXUEPESitUpdateCO() {
}


public static final String RCS_ID = "$Header$";
public static final boolean RCS_ID_RECORDED = VersionInfo.recordClassVersion("$Header$", "%packagename%");