transaction aborts on alternate identical attempts

[Graham]

Hi

I have a page that uploads an xml file and reads it into a SQL database. The
page is transactional and aborts if there are any anomalies in the xml.

My problem is that the if I repeat an identical import the transaction
succeeds the first time and then fails the next time. This pattern continues
with subsequent repeats. I have removed all of the ObjectContext.setAbort()
calls but still the onTransactionAbort() sub is called.

Has anyone ever encountered similar behaviour?

Thanks in advance

Graham