Tag this discussion.

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I just read a discussion that says if you tag the discussion before you respond it won't ask you again to tag it before you submit it. Well this doesn't work for me. It still asks me for a tag. Have you tried doing this? Does it work for you? Am I doing something wrong? Why does it ask me again? Am I supposed to tag it again? I have no choice but to tag it again or it won't post. Why?