You can still cancel or revert released Outbound Delivery when follow-up documents like Customer Invoice is released.
Business ByDesign all versions.
This occurs because there is no check from Outbound Delivery side to confirm the existence of a Customer Invoice.
This is system's current design.
You can cancel/revert an Outbound Delivery even if a Customer Invoice is already created or released.
The same happens to all documents in the system. For instance, you can cancel a Sales Order even if there is already an Outbound Delivery linked to it.
Cancel Outbound Delivery, Customer Invoice, consistency check , KBA , AP-XCI , Customer Invoicing , Problem