I am using flat rate shipping service and I want to add a value to shipping service price, I know drupal commerce has a rule for this job,
Add an amount to the unit price , but when I want to complete it I don't know what is should enter in Line item section ?
I try below one by one
but no one work. exactly what this mean, I want add value to only line item that is shipping type, I search google but didn't get any example or something similar this.
appreciate any lead an suggestion about what I should enter in line item ?