How to default systematically generated burden costs in capital projects as non-capitalisable

Summary:

Our client's accounting policy is such that only raw costs are capitalised. But they would still like to calculate burden costs as a separate expenditure item so those burden costs can be accounted separately and charged to P&L. So I have setup a project type with setting the radio button "Create separate expenditure item for burden cost" and ticked "Create burden cost accounting journal entries"

Oracle also appears to capitalise only raw costs which works with our client's accounting policy however these calculated burden costs are also flagged as "capitalisable" as it seems to follow capitalisable flag from source expenditure item. How do we setup these burden costs to be "non-capitalisable" by default for capital projects without the need to perform mass adjustments.