Multiple updates on dataset = concurrecny exception

I am getting concurrency exceptions whenever I try to update a dataset more than once. For example, if I fill a dataset, modify data, and then call the data.update method, it works fine. However, if I fill a dataset, modify data, call data.update, modify more data, and then call dataset.update again, I get a concurrency excetpion. I know that the table can be updated with no problem, and I do not get this problem on other data providers. It seems that ODP requires you to requery your dataset after each update, which doesn't seem correct to me. I tried requerying a dataset after each update and that does indeed work, but it seems unnecessary. A sample code snippet is below. Can someone let me know what I am missing.
In the snippet below, the "dataSet" variable is a dataset which has already been filled and one records has already been modified.
Dim command As New OracleCommand
command.Connection = connection
command.CommandText = sqlhelper.getStatement("evaluation", "update")
'first insert
adapter.TableMappings.Clear()
adapter.TableMappings.AddRange(sqlhelper.evaluation_table_mapping)
Dim cb As New OracleCommandBuilder(adapter)
adapter.SelectCommand = command
adapter.Update(dataSet, "egov_evaluation")
'2nd insert
'change some data
CType(dataSet.Tables(0).Rows(0), EvaluationDataSet.egov_evaluationRow).gov_agencies_attendees = "new test update"
adapter.TableMappings.Clear()
adapter.TableMappings.AddRange(sqlhelper.evaluation_table_mapping)
Dim newcb As New OracleCommandBuilder(adapter)
adapter.SelectCommand = command
adapter.Update(dataSet, "egov_evaluation")

Followup:
This issue was caused by the SQL statement generated by the command builder. For those who haven't seen it yet, the command builder will generate a sql statement like "UPDATE <table> set <column1> = <value1>, <column2> = <value2> where <column1> = <orig column1 value> and <column2> = <orig column2 value>"
So if any of the fields don't match up in the where clause, you get the concurrency exception. We were getting stale data, and another issue caused by a bad query generated from the command builder, but this is worked around by writing our own update statements.
The only annoying thing is that our app doesn't care about concurrency, so we actually wanted to turn off the concurrency checking in the where clause, but, such is life.

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Hi experts,
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Hi experts,
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Release 12.1.1.
OS is Red Hat Ent Ed 4
i am trying to change the employee assignment category from Junior to Senior. so when i am updating the assignment details on the assignment screen (Navigation is People >Enter & Maintain> Assignment) and trying to save, the system gives error on the status bar of the application as follows:
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Multiple updates on dataset = concurrecny exception

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