File missing from repository

 We use Visual Studio.NET, SVN and TortosieSVN. There are times when VS.NET generates a .CS file (C# code file) for a Crystal reprt file automatically. Some of the coders in the team check these newly generated .CS file in to the repository and others do not. When the one who did not check it in tries to update his WC, he gets a 'File already exists' error even though the file has not been versioned. So some of them have it in version and some do not. So while i was trying to manage these kind of inconsitencies , the repository seems to have lost the Crystal report corresponding to one such inconsistently versioned .CS file.
    
    How can a file get missed out from the repository though a file with the same prefix, but a different suffix was being managed ?
    
    Any guesses on what could have gone wrong ?
    
    Thanks and regards,
    
    Chakravarthy.

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