Fix for https://openedx.atlassian.net/browse/LEARNER-6529 Can't edit coupons with fixed prices
Fix for https://openedx.atlassian.net/browse/LEARNER-6529 Can't edit coupons with fixed prices

edx/ecommerce,eduNEXT/edunext-ecommerce,eduNEXT/edunext-ecommerce,eduNEXT/edunext-ecommerce,edx/ecommerce,eduNEXT/edunext-ecommerce,edx/ecommerce,edx/ecommerce