If the database is in recovery mode "simple", you can simply truncate the transaction log by issue a "backup log
Take a look at the SQL Server books online for more detailed information.
You can read the SQL Server logs and the System Log in SAP to see if you can find out what exactly caused the transaction log to fill up. It could be that there was an open transaction that never got committed. You can also run "dbcc opentran" next time, as soon as you see this problem. But, hopefully you will not get this problem again. The best thing is to set up an alert that triggers a transaction log backup if the log fills up to a determined percentage, like 80%.
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