a CO extension has been created in DEV instance r12.2.5 and It is not working - it substituted succ

Exception Details.

oracle.apps.fnd.framework.OAException: Could not create Java class: (oracle.apps.eam.workorder.webui.xxWorkOrderCompletionDataCO) associated with region: (FndNestedRegion2). This is probably because the class name is wrong or not included in project. at oracle.apps.fnd.framework.webui.OAPageErrorHandler.prepareException(OAPageErrorHandler.java:1275) at oracle.apps.fnd.framework.webui.OAPageErrorHandler.processErrors(OAPageErrorHandler.java:1461) at oracle.apps.fnd.framework.webui.OAPageBean.processRequest(OAPageBean.java:2964) at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:2066) at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:585) at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:473) at _pages.__oa._jspService(__oa.java:233) at weblogic.servlet.jsp.JspBase.service(JspBase.java:34) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:184) at weblogic.servlet.internal.RequestDispatcherImpl.invokeServlet(RequestDispatcherImpl.java:526) at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:253) at weblogic.servlet.jsp.PageContextImpl.forward(PageContextImpl.java:159) at _pages.__rf._jspService(__rf.java:239) at weblogic.servlet.jsp.JspBase.service(JspBase.java:34) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301) at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60) at oracle.apps.fnd.security.WLFilter.doFilter(WLFilter.java:213) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60) at oracle.apps.jtf.cabo.interceptor.JTFWrapperFilter.doFilter(JTFWrapperFilter.java:149) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60) at oracle.apps.jtf.base.session.ReleaseResFilter.doFilter(Unknown Source) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60) at oracle.apps.fnd.security.AppsServletFilter.doFilter(AppsServletFilter.java:432) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60) at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:138) at java.security.AccessController.doPrivileged(Native Method) at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:324) at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:464) at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:121) at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:211) at