Preconditions:

• Added Product type (by default Product Specification filed do not have VAT Category enabled)
• Added Product based on Product Type (step 1 preconditions)

Steps to reproduce:

1. Go to product page of created product e.g /product-catalog2/product1
2. Click on 'Add to basket' button.
3. Verify that product has been added to the basket.

Actual result:

See attached screenshots

Product has not been added to cart

Your basket is empty! 

Expected result:

Product properly added to the basket.

Note:
If you encounter this problem use configuration from ibexa.yaml file (add regions and vat categories to default repository). Do not create in config file another repository shop as it's described in the doc: https://doc.ibexa.co/en/4.3/pim/enable_purchasing_products/#vat-rates

Properly configured default configuration can be found in attached ibexa.yaml config and below:

Ibexa:
 Repository:
    product_catalog:                
       engine: default                
       regions:                    
          poland:                                               
             vat_categories:                            
                standard: 18                            
                reduced: 6                            
                none: ~

Other possibilities of case where product is not added to cart:

• the product has no set price
• the product has no set availability