How to update IB Asset DFF as null

Summary:

We have an existing Asset in IB where data already stored in that DFF. But we want to update it as a null and show blank value in it. We tried most of the values like (#NULL, NULL, $null$, !, space) in FBDI template but it always taking it as a string and update the record values. Can anyone help on this that how to achieve this in IB Asset DFF in a bulk load update?

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