Use this session to ratio history data.
          
         
          Field Information
          
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            Remove History to year
           
 
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Enter the year up to which history must be deleted.
            
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            Ratio
           
 
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The first ratio in the range.
            
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            Ratio
           
 
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The last ratio in the range.
            
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            Backup File
           
 
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Enter a location for a backup file.