Log truncation fails on SQL 2005 and SQL 2008 server

This problem was coming on SQL 2005 and SQL 2008 SQL server on both 32 bit as well as 64 bit platforms. After much digging into it, I found that issue comes only with fresh SQL server or any fresh database on the SQL server. The problem occures because I was trying to truncate the logs before taking FULL backup of the database which is not allowed by the Microsoft. This seems to be logical as well; logs cannot be truncated unless database is backed up atleast once. Here is the link from Microsoft web site which supports same thing.
http://msdn.microsoft.com/en-us/library/ms186865.aspx.