The complete checkout validation group is difficult to override

[coldic3]

Sylius version affected: 1.12

Description
In the route sylius_shop_checkout_complete the validation group sylius_checkout_complete is used, please see

Sylius/src/Sylius/Bundle/ShopBundle/Resources/config/routing/checkout.yml

Line 91 in 466793c

validation_groups: 'sylius_checkout_complete'

IMO it should be done in the sylius.form.type.checkout_complete.validation_groups param instead as it is done with all other steps. Now if you want to replace Sylius validation with your own validation you need to override the entire sylius_shop_checkout_complete route config.

Possible Solution
Let's add sylius_checkout_complete group into the sylius.form.type.checkout_complete.validation_groups param.