Overall, the system works on a permissive basis and you can only change certain allowed items depending on an Order/Line Item's current status. This is to help ensure data integrity as a print progresses through the manufacturing process. To see the rules around changing these statuses, please see this page.
As a reminder, the high-level flow of statuses can be seen below. Full status definitions can be found here.:
New > Pending > Confirmed > Complete/Cancelled
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Line Item or Order status of New or Pending:
 you can change any data within the line item/order
When the Line Item status is Confirmed or higher:
You can change:
Model Units
Layer Thickness
Notes
Material
Design Hours (but the price won't update based on them)
You cannot change (this is not an exhaustive list):
Model/Design File
Service Provider
Please note: The Production Workflow is able to be amended once the printing run has been completed via the production change mechanism. This process is outlined in this article.Â
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When the Order status is Confirmed or higher:Â
You can change:
Model UnitsÂ
Customer Information/Shipping Information
Order Owner
Notes
Custom Fields
You cannot change:
Order Offer/Quote Information