look at your sql server express edition it should be 9.00.3042 which means Service Pack 2 and your enterprise edition is 9.00.1187 which means june 2005 CTP.
SP2 has some significant updates in it thus you are not able to restore it on old version. if you apply latest SP3, issue will be solved.
But i recommend to reinstall your enterprise instance with RTM which is 9.00.1399. It is not recommended to use CTP in production.
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by: bmatumburaPosted on 2009-10-11 at 02:05:54ID: 25545297
I suggest you install the latest SQL Server 2005 servicepack