Product variants and tax ID and warehouses

-- HikaShop version -- : 3.4.0
-- Joomla version -- : 3.8.7
-- PHP version -- : 7.0

Hi,
my customer has a couply products with a special warehouse and product_tax_id and variants. (Specifically magazine subscriptions with options for national and international shipment, etc.) In the main product, the warehouse and tax_id are correctly set, however when looking in the database, some of the variants have the product_tax_id and product_warehouse_id set, some don't.

When you add one of the products where those are not set to the cart and go to the checkout, it doesn't select the right/any shipment method and buying that cart subsequently fails. I tried saving the variants again and the main product, but that didn't change a thing. I then changed the data in the database directly and that worked.

Is this a bug? How can I prevent this in the future? Where does this come from? I'm a bit confused...

I'd like to make sure that my customer can create other products with variants without having me to go into the DB and fixing values....

Hi,

The tax category and warehouse are only supported for the main product.
It's not possible to set them for variants via the product edition interface in the backend.
So either it has been added in the database, or via a mass action or a CSV import.
So there should be nothing necessary to prevent that in the future besides yourself not changing them through a mass action, a CSV import or directly changing them in the database.