Throughout the life of a sales order, the sales order goes through multiple status:
The document status come pre-defined (no config)a can't be changed. They automatically gets updated as part of confirmation, picking list, packing slip and Invoice.
The benefit document status provide is what the latest and greatest action that has happened on the sales order.
If you have 10 qty and only invoice 1 qty. Document status = Invoiced but order is still in 'Open order' status
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