Save and Resave in Microsoft Excel 2003 or Earlier
Avoid this situation because data loss could occur if you :
Save an XLS workbook to one of the Microsoft Excel 2007 or later file formats.
Open the workbook that was created in step 1 and resave it either in the same file format or back to XLS.
If one of these scenarios occurs, contact Customer Support for further assistance. For contact information, see
http://www.oracle.com/crystalball