Import Rate->Life->"Plan Cost Calculation Basis" value is not get imported properly.

1] Login to the application on Stage environment .
2] Search a Company.
3] Navigate to Customizer>Rates.
4] Click on "Import" button the "Rate Import" window gets display.
5] Click on “Add New Rate” tab.
6] Select “Life” as a benefit template type.
7] Click on “Download File” button, entered the details in exported file.
8] Entered the "Plan Costs Calculation Basis" value as specific date.
9] Browse and Upload the file, click on "Import Rate" button.
9] Observe the imported rate from application.
Actual Result:
"Plan Cost Calculation Basis" value always sets to "Age or Years of Service as on January 1 of Current Year" irrespective of what mentioned in the excel sheet.
Expected Result:
"Plan Cost Calculation Basis" value should be get imported properly.