In order to help merchants better manage product shipping settings, variation-level shipping settings will soon be deprecated (date to be announced). After deprecation, shipping settings may be set on a product-level only. More information about this planned variation-level deprecation will be shared in a future system update announcement.
To prepare for this change to product-level shipping settings, please review your listings and add country shipping prices for individual products where needed.
Please also note that with this transition, starting July 3, 2018 00:00 UTC, if a product has the country’s shipping price set under the product’s “International Shipping Settings”, merchants will be unable to change it to “Use Product Shipping Price.”
In Products > View All Products > Actions > Edit International Shipping Prices, Product A has the International Shipping Prices for certain countries, as shown in the screenshot below. Starting July 3, 2018 00:00 UTC, the merchant may not change the the shipping settings to “Use Product Shipping Price” for the countries Australia, Austria, and Belgium.
How can I view/edit the “International Shipping Prices” for my products?
Manual Shipping Settings FAQ
API Shipping Settings Docs: (following end points contain Variant shipping field)