Differences in 9i and 10g imp

Hi all,
I've just done an import from production into two dev databases. One which is 9i and the other 10g. Comparing the two logs, I got the following error on the 10g, but not on 9i which to me seem strange:
ORA-02299: cannot validate (XXX.<table__name>) - duplicate keys found.
Not sure why this has happenend on 10g but not on 9i as the imports were done exactly the same.
Would appreciate any comments on this
Thanks

If you run:
$ oerr ora 2299
02299, 00000,"cannot validate (%s.%s) - duplicate keys found"
// *Cause: an alter table validating constraint failed because the table has
// duplicate key values.
// *Action: Obvious
You'll see that imp has attempted to validate and enable a constraint after importing the data and has encountered duplicate data on a unique constrained column or group of columns.
I'm suspecting if it worked in one database and not another, you've specified ignore=y and there is already data in the 10g database. But as suggested, please provide the imp command used.
Cheers,
Stuart.

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