Shipping Cost Problem for Import Invoice from .CSV

[cypee]

Hi

I using Import Invoice from .CSV to import my invoice, i create a field name Shipping Cost and insert my shipping amount $5, after import, the shipping cost in invoice still show 0.00

Example:

Product Unit price is $10, Shipping is $5, So total Invoice should be $15

after import, invoice Total only $10 and Shipping is $0.00

Is that I doing any mistake on my .csv files or wrong field