How to make a DFF on the Invoice Distributions screen mandatory using Forms Personalization rules or

Good Morning All,

I am trying to mandate a DFF field existing on the Invoice Workbench Distributions screen, based on the entries (paygroup) user choose on the Invoice header screen. For example, if the user chooses the paygroup on the invoice header as 'Paygroup 1', I need to mandate the user to enter the Invoice distributions DFF and should not allow the user to close / exit the screen unless entered the valid value.

If the user on the invoice headers screen chooses the paygroup as 'paygroup 2', then there would not be any validations on the Invoice distributions screen and the user should be able to exit the form without any issues.