cannot modify appointment

[b_roit]

I use the zimbra client JAVA API to create/modify appointment via ZMailbox. Creation process works fine but when I try to modify the created appointment I get the following SOAP fault exception:

com.zimbra.common.soap.SoapFaultException: The specified Invite is out of date (has been updated): 7eec32ea-bf61-4079-b622-67545c076bee:33029
ExceptionId:com.zimbra.cs.mailbox.MailServiceExcep tion: The specified Invite is out of date (has been updated): 7eec32ea-bf61-4079-b622-67545c076bee:33029
ExceptionId:btpool0-1954://*/service/soap/ModifyAppointmentRequest:1311611767812:964357f754e a48dc

My code is so
package soap;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

import com.zimbra.cs.zclient.ZDateTime;
import com.zimbra.cs.zclient.ZInvite;
import com.zimbra.cs.zclient.ZInvite.ZComponent;
import com.zimbra.cs.zclient.ZInvite.ZInviteType;
import com.zimbra.cs.zclient.ZMailbox;
import com.zimbra.cs.zclient.ZMailbox.Options;
import com.zimbra.cs.zclient.ZMailbox.ZAppointmentResult;
import com.zimbra.cs.zclient.ZMailbox.ZOutgoingMessage;
import com.zimbra.cs.zclient.ZMailbox.ZOutgoingMessage.Me ssagePart;
public class ZimbraAppointment {
private static final String FMT_DATE_TIME = "yyyyMMdd'T'HHmmss";
public static void main(String[] args) {
try {
Options opt = new ZMailbox.Options();
opt.setAccount("***");
opt.setPassword("***");
opt.setUri("****");
ZMailbox mb = ZMailbox.getMailbox(opt);
TimeZone tz = TimeZone.getDefault();
ZInvite invite = new ZInvite();
ZComponent comp = new ZComponent();
comp.setStart(new ZDateTime("20110726T170000", tz.getID()));
comp.setEnd(new ZDateTime("20110726T210000", tz.getID()));
comp.setLocation("loc");
comp.setComponentNumber("0");
comp.setName("boris2");
invite.getComponents().add(comp);
invite.setType(ZInviteType.appt);
ZOutgoingMessage message = new ZOutgoingMessage();
message.setSubject("test zclient API");
message.setMessagePart(new MessagePart("text/plain", "this is da body"));
DateFormat dateFmt = new SimpleDateFormat(FMT_DATE_TIME);
String dateTime =dateFmt.format(new Date());
ZAppointmentResult appointmentResult = mb.createAppointment(mb.getCalendar().getId(),null , message, invite,null);
ZAppointmentResult result = mb.modifyAppointment(appointmentResult.getCalItemI d(), "0", new ZDateTime(dateTime,tz.getID()), message, invite);
} catch(Exception e) {
e.printStackTrace();
}
}
}

Please help me.

[b_roit]

yes! it's solved!!!

ZAppointmentResult result = mb.modifyTask(appointmentResult.getInviteId(), "0", null, message, invite);