To do it using the GUI, you have to simulate a click on the MenuID under File -> Save As Draft for the document that can be saved as draft.
To simulate the click, you will have to capture an event such as a button click, ie, when the user clicks on the Add button to add the document, you capture the event and save as draft instead.
To save as draft on a standalone app or using the DIAPI, you have to use the company object to get the oDrafts document. After creating the draft object you have to populate the fields with data.
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