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For example, it is right now not possible to add a Userpoints discount without filling out your personal information.
See http://api.drupal.org/api/drupal/includes--form.inc/function/form_set_er...
Comments
Comment #1
Bart Vanhoutte CreditAttribution: Bart Vanhoutte commented+1
Comment #2
mrfelton CreditAttribution: mrfelton commentedLatest dev code uses ajax callbacks to apply userpoints credits and refreshes the cart in realtime to show the changes. Since this doesn't actually submit the form, validation errors on other form elements no longer matter.