How Can we lock the DFFs down once they've been populated initially? Can we find DFF Audit History ?

Organization Name: Assurant
Description (Required): Can we lock the DFFs down once they've been populated initially? Ideally once Accounting has been processed. Now this is not feasible at the moment to freeze the DFF fields, however we are checking the possibilities of making the field as a Read only.

Use Case and Business Need (Required): Users are amending the DFF fields populated in the Distribution tab at the distribution line level, which impacts downstream systems. Therefore, once the invoice accounting status is marked as ‘Processed,’ the DFF fields should be locked (freeze/read-only) to prevent any modifications after accounting is completed.