The validation is applied to each plan, but the required message is only being shown on the first plan. The plan selection is actually just a radio or multicheckbox field. So it has the same/similar validation being applied with the exception that CBSubs has completely customized and HTML based labels for their values. It looks like the display of the validation needs to be moved to be before or after the plan selection. I've added a bug ticket to fix the location of the validation error message.

#5539

The hidden plan is probably still checked, which is why the required state is considered passed. I've noted this in the ticket to fix the jQuery to reset the value of any hidden input.

Do you have a workaround in the mean time so that I could manually correct it and try your suggestion with jquery to unselect the default plan ?

I don't have a workaround to suggest at this time.

No I ve checked by removing all css styles, no plan are checked and yet the step is considered passed.
Last year I already ask you the same question and did not get an answer. The only solution was to show the first plan which is no longer an option for our marketing needs.

Can you tell me what jquery to add to auto action to remove all default plans only on registration page for testing it ?

I do not have a solution for you at this time. The ticket is pending Beats investigation.

If we cannot use a query field as input for a plan price, what is the solution to compute a price from different fields in a plan ?

To adjust the price based off the value of a field you need to use CBSubs Promotions and apply a negative promotion to increase the price of the plan. This will not show on registration though as a user doesn't exist yet so the query field can't do anything at that point.