Inserting NULL values from Excel to the Decimal Column in Database data Conversion SSIS

Hi,

I have a Excel Source in which i have a decimal column . Some of the values are saying as "NULL" instead of a decimal value.  I am using data conversion - Data Flow Transformations Shape.  I am getting error. How can i take the text "NULL" into the decimal Column.  After the Data Flow task,  the column in the database should show null values for the "NULL" being passed.

Thanks,

-Prasad

-Prasad