This is absolutely not an issue.
-forum.persia-cms.com/persia-cms-vt92.html#342 and -forum.persia-cms.com/persia-cms-vt92.html are not duplicate, any decent bots knows its just an html anchor in the same page.
Now, I had not noticed such URL listed before, maybe it is because the post links are finally useful as they are redirected and Yahoo is taking these as important since they are linked from the index.
Anyway, you can check both have the same exact PageRank, it's just the same page.
Could be interesting to see if this leads to both URL showing up in search result sometime. Imagine two time the same page without PR loss thus showing up together in SERPs
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