DFF defaulted from SQL

Summary:

Team, looking to see if anyone has defined a DFF for default value being a SQL query coming from a different area of Oracle. What we are trying to do: 

• We have defined a DFF at Supplier Header Level with a Date.
• We have the same DFF at Purchase Order Header Level 

We want the DFF at PO Level to default from the Supplier DFF. Any thoughts/how-to are appreciated

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