How to default Header DFF to line level DFF on purchase order (cloud)

Summary:

How to default Header DFF to line level DFF on purchase order (cloud)

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business wants one of the DFF create on header level and it has be default all lines level DFF. ( so that they can only change/update on few lines - out of 50 lines, 45 lines data is similar to header data, only 5 might be different, so that only 5 lines they edit and change) - defaulting PO Header DFF to Line level DFF functionality on oracle cloud

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