How to make a DFF to be mandatory for certain Transaction Types?

Summary:

How to make a DFF to be mandatory for certain Transaction Types?

for instance:

We have created a global DFF on Invoice Header Level, our requirement is to make the DFF mandatory in case of the invoice transaction type equal transaction Type A or B or C only?

What's the the logical condition to be written in expression builder using the sandbox customization in order to achieve our requirement?

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