Currently there are no support for changing trigger dates (Contract Effective Date, Service Activation Date, Customer Acceptance Date) using the orders functionality. It is possible using amendments but not orders. This is needed when unintentiallly setting the wrong trigger dates when creating subscriptions using orders. See https://knowledgecenter.zuora.com/BC_Subscription_Management/Orders/C_Known_Limitations_in_Orders "Trigger Dates: Once rate plan charge trigger dates are set, you cannot directly update or override the trigger dates."
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