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Strange issue with a complex stored procedure and Union Query

I have a complex stored procedure that executes on a schedule. It runs a union query and inserts the results into a table. I recently discovered that it needed to have a LIMIT added to both queries so I enclosed the two selects in brackets, and immediately the query error'd. Removing the brackets allowed the query to run correctly.

Are there any issues I should be aware of?

Answer Answered by Ian Gilfillan in this comment.

http://stackoverflow.com/questions/213851/sql-query-using-order-by-in-union probably answers your question.

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