Check the backup model for the database is it in Full or Bulk model. If its in Simple then you cannot back up the transaction log as no transactions are written to the log.

Regards

Jon
>Hi.
>I have a management plan, which among other things backs up transction logs of three databases. The problem is that a transaction log backup procedure for one of those databases fails with the following message:
>"Backup can not be performed on this database."
>I compared the properties of the transaction logs of all the databases, they look similar. Only the size of the transaction log in question is only 1Mb.
>Thank you.
>Kamil