How to create element eligibility based on DFF fields under assignment

Summary:

How to create element eligibility based on DFF fields under assignment?

for eg: we have set a check box under employee assignment as : Air Ticket ELigibility.

If "Air Ticket ELigibility = Y", then element "Air Ticket Payment" should be available for entry, for the employee.

If "Air Ticket ELigibility = N", then element "Air Ticket Payment" should NOT be available for entry, for the employee.

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