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If I generate an excel-report, excel 2010 shows the following warning message:
file error: data may have been lost
Note: I already have found the solution and will post it immediately. I make this entry for other people having the same error.
It turned out, that the reports data source had in a value of -0 (negative zero). The datatype was
decimal. Excel can not handle this.The problem seems to lie in the Excel formula engine and not in the report renderer (However I think MS has to solve the problem in the report renderer).
http://connect.microsoft.com/SQLServer/feedback/details/680863/negative-zero-causes-file-error-data-may-have-been-lost-in-excel-2010-when-exporting-ssrs-report