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The TRUNCATE TABLE command is a DDL command. Unlike DML commands (INSERT, UPDATE, DELETE), a DDL command will not wait for a lock to be released. Instead, the DDL command will fail and the ORA-00054 error will be raised.
Temporary tables do not belong to a program. If your TRUNCATE TABLE command is resulting in the ORA-00054 error, then some lock, even a shared lock, is causing this problem. It could be that a previous execution of your code has not released the locks, or that some other program or code has the lock. The only way to know for sure is to query V$LOCK at the time this happens. Querying V$LOCK, and subsequently V$SESSION, will show you who has locked your object. On my web site, I have a white paper titled "Solving User Problems." This paper shows you how to query V$LOCK for the information you seek.
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