Shipping method required
For Manual Order Entry it is possible to leave the Shipping Method blank. If blank, it will use the default Shipping method. However this might not be the correct shipping method, but a different Shipping method that simply is not selected whilst creating the order.
When this setting is set to true, it makes the shipping method required and that will trigger a validation error upon trying to create the order rather than filling in the default shipping method.
The Shipping method required setting, could be configured by Order Type.
INFO! If no order type is selected, it will be applied to all available order types.