Inbox Item Bulk Operation Limit

I have a functionality like all the inbox item for a particular user with Role has to be downloaded to excel sheet and update from excel sheet. Then upload to Application. Once uploaded I want to move all inbox item to next activity.
I do something like below..
inboxItem.grab(grabActivity : "GrabMyEvents");
inboxItem.runTask(activity : "GrabMyEvents");
inboxItem.routeBack(skip : false);
It work for 400 inbox items. User may have around 2000 inbox items. Is there any limit on this or I am doing something wrong?
I get following if I try above 400.
Caused by: Unexpected exception while enlisting XAConnection java.sql.SQLException: XA error: XAResource.XAER_NOTA start() failed on resource 'XAENGINEDS': XAER_NOTA : The XID is not valid
javax.transaction.xa.XAException: [BEA][Oracle JDBC Driver]Oracle XA Error Occurred. Native Error: 24756
     at weblogic.jdbcx.oracle.OracleImplXAResource.checkError(Unknown Source)
     at weblogic.jdbcx.oracle.OracleImplXAResource.start(Unknown Source)
     at weblogic.jdbcx.base.BaseXAResource.start(Unknown Source)
     at weblogic.jdbc.jta.DataSource.start(DataSource.java:695)
I use Oracle BPM 10.3.0.1

Let me clear little more so that somebody can help me....
I have code something like below
Fuego.Papi.Instance inboxItem;
Fuego.Papi.ProcessService processService;
processService.connectTo(url : Fuego.Server.directoryURL, user : "user", password : "pwd");
Then I get each process instance using below
forEach(records in our application database){
inboxItem = processService.getInstance(instance : "instance Is's which stored in application database");
inboxItem.grab(grabActivity : "GrabMyEvents");
inboxItem.runTask(activity : "GrabMyEvents");
inboxItem.routeBack(skip : false);
processService.disconnectFrom();
The above code works fine for around 400 records.If I try for more than 400, I get following errors thrown by BPM
Caused by: Unexpected exception while enlisting XAConnection java.sql.SQLException: XA error: XAResource.XAER_NOTA start() failed on resource 'XAENGINEDS': XAER_NOTA : The XID is not valid
javax.transaction.xa.XAException: [BEA][Oracle JDBC Driver]Oracle XA Error Occurred. Native Error: 24756
at weblogic.jdbcx.oracle.OracleImplXAResource.checkError(Unknown Source)
at weblogic.jdbcx.oracle.OracleImplXAResource.start(Unknown Source)
at weblogic.jdbcx.base.BaseXAResource.start(Unknown Source)
at weblogic.jdbc.jta.DataSource.start(DataSource.java:695)
But I do see that all loop is executing for 2000 records also. Looks like something BPM internally throw this exception. I feel some configuration change in BPM will fix it. Is there any limit with BPM which can handle Fuego.Papi.Instance at a time in loop?

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Message was edited by:
srinivas vandana

Thank you for your answer. I haven't mention this point in my thread but I have already tried this.
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