vmError: The workflow for or C is unknown, take a look on model/orders function handleStockAfterStatusChanged
In your case there is an answer, you created an orderstatus without workflow. Hmm stupid message, because when the workflow is set to empty or something unknown that is is often just a misconfiguration, but it can be also on purpose.
Maybe I should remove the message and show this as warning, when listing or editing an orderstatus like this. But next release, I think. So long you can just remove the message, it is on the orders model function handleStockAfterStatusChangedPerProduct.
But I do not really understand the error, looks like you use an other orderstatus, which is not listed in the db.
and
important, you CANNOT add new orderstatus to vm2.0.4 or older. You must use 2.0.6