How to create a DFF field with Data Type as Date on the Subinventory Transaction Header

Hi,

We have a requirement where we want to capture an additional date apart from the Transaction Date while creating a Subinventory Transfer in Inventory Management. We want to add this Date DFF field on the Header. The only Flexfield Code available at the Subinevntory Header is INV_TRANSACTION_SOURCES which is only accepting Data Type as "Character". If we select Data Type as "Date" or "Date Time", then we are unable to select the ATTRIBUTE value.