Issue with wM 8.2

I have designed a portlet in 7.1.2 and 8.2. The portlets are almost similar. In 7.1.2, everything is working as expected, but in 8.2 (with similar settings as 7.1.2) I am getting an error while writing back to DB from the portlet. The error is as follows:

com.webmethods.caf.faces.data.ContentProviderException: rowIdProperties property is not set. Cannot process applyChanges().
at com.webmethods.caf.faces.data.sql.RowSetTableContentProvider.applyChanges(RowSetTableContentProvider.java:732)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.el.parser.AstValue.invoke(AstValue.java:187)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
at com.sun.faces.application.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
at com.webmethods.caf.faces.application.CAFMethodBinding.invoke(CAFMethodBinding.java:65)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:387)
at com.webmethods.caf.faces.component.ViewRoot.broadcastEvents(ViewRoot.java:227)
at com.webmethods.caf.faces.component.ViewRoot.processApplication(ViewRoot.java:120)
at com.webmethods.caf.faces.portlet.PortletLifecycle$InvokeApplicationPhase.execute(PortletLifecycle.java:723)
at com.webmethods.caf.faces.portlet.PortletLifecycle.phase(PortletLifecycle.java:261)
at com.webmethods.caf.faces.portlet.PortletLifecycle.execute(PortletLifecycle.java:151)
at com.webmethods.caf.faces.portlet.FacesPortlet.processAction(FacesPortlet.java:300)
at com.webmethods.portal.framework.portletcontainer.impl.PortletApplicationHandler.process(PortletApplicationHandler.java:480)
at com.webmethods.portal.framework.portletcontainer.servlet.PortletServlet.service(PortletServlet.java:58)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:327)
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
at com.webmethods.portal.framework.portletcontainer.PortletContainer.dispatch(PortletContainer.java:219)
at com.webmethods.portal.framework.portletcontainer.PortletContainer.process(PortletContainer.java:130)
at com.webmethods.portal.framework.portletcontainer.PortletContainer.processPortletAction(PortletContainer.java:108)
at com.webmethods.portal.framework.portlet.beans.rest.RestfulPCAHandler.handle(RestfulPCAHandler.java:194)
at com.webmethods.portal.framework.dispatch.DispatchManager.handle(DispatchManager.java:438)
at com.webmethods.portal.framework.dispatch.DispatchManager.handleDispatch(DispatchManager.java:369)
at com.webmethods.portal.framework.impl.PortalServlet.service(PortalServlet.java:272)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.webmethods.portal.framework.impl.NTLMFilter.doFilter(NTLMFilter.java:50)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.webmethods.caf.faces.servlet.GZIPFilter.doFilter(GZIPFilter.java:42)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:451)

Please help me to fix this error.

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