You may encounter the following error when trying to finalize an order via the Purchase, Sales, or Production Order Manager:
The {type} order cannot be finalized because it has active activity lines.
In order to finalize an order, all of its activities must be finalized, so make sure that there are no unprocessed activities related to the order.
Remember to also check for historical activities: activities with the status IntegratorProcessedError or IntegratorClaimed could not be processed by the integrator and ESB, respectively.