Are you referring to a workflow on sales orders? That is not a standard feature. That might be a customization in your environment or part of a vendor solution. You can check with your partner or developer if additional logic is implemented to validate POs in case the workflow is not completed yet.
1. Yes, on the order line details, tab Product, you can see the item reference which is the showing the purchase order number and the reference lot number which is the technically the InventTransID reference from inventory transactions.
2. Yes, this is marked directly when creating the PO.
3. A service order is not used for sourcing the item, but to provide additional services, e.g. installing or setting up the item for the customer.
The direct delivery will tell the vendor to ship the goods directly to the customer's address where with a PO, you will first receive the goods in your own warehouse.
4. What is your definition of DRAFT? Do you mean you create a journal type of SO which will be later converted to a regular sales order?
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