Plugin Deleting fields that are not set in the excel.

Hi,

My .csv file just has :
sku post_title stock manage_stock

It is setting the stock correctly, but it is deleting my Regular Price, Sale Price and Short Description.

How can I stop it from deleting these fields.

Is there any variation where this issue will not happen.

Thanks,
Anuja

http://wordpress.org/plugins/woocommerce-csvimport/