Steve, when we've seen this, there has been a duplicate TLE for a single statement/document, but not for all. Check the failing record for such a condition. (like below where account is duplicated but the rest of the TLEs aren't.
:Lyy :::::::: :: :4::::
:Ly? :00013005::: PDR-AT0001300500034932::? F2DUMM00
:L?? :::: DATE:: 20060713
:L?? :::: ACCOUNT:: 123456789
:L?? :::: ACCOUNT:: 987654321
:L?? :::: NAME1:: AnyAccount