Problem in synchronizing data

Hi all,

   I am developing an android test app (object api) for synchronizing data of BAPI_SALESORDER_GETLIST. I did the following for the MBO creation on server.

1. As input paramters i selected TRANSACTION_GROUP (set default value 0) , SALES_ORGANIZATION and CUSTOMER_NUMBER.

2.  Set SalesOrder table as output parameter.

3. Created 2 synchronization parameters sorgsp and custnosp.

4. Mapped the load arguments SALES_ORGANIZATION and CUSTOMER_NUMBER to sorgsp and custnosp.

Now in my mobile application when I do a sync

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SOrderTestDB.disableChangeLog();

                              SOrderTestDB.synchronize();

                              SOrderListSynchronizationParameters spar = SOrderList.getSynchronizationParameters();

                              spar.setSorgsp("1000");

                              spar.setCustNosp("0000100000");

                              spar.save();

                              SOrderTestDB.synchronize();

                              System.out.println("Kumar came till here");

                   SOrderListSynchronizationParameters spar1 = SOrderList.getSynchronizationParameters();

                              spar1.setSorgsp("1000");

                              spar1.setCustNosp("0000100001");

                              spar1.save();

                              SOrderTestDB.synchronize();

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My first sync for values 1000 and 0000100000 succeeds but subsequently whenever I try to sync next [portion marked in bold] i get error.

I am attaching the clent and server errorlogs.

Please guide me why the sync error is coming whenever i try to sync the second time with new set of sync parameters. Please help me.

thanks and regards,

Kumar.