How to delete data in Requisitions Headers DFF?

Hi Dear,

We have some requisitions with data in DFF (Requisitions Headers), here exist certain setup using only two attributes.

But now, We need to change this setup in DFF, but before to do this We need to delete or clear the data existing… When We want to delete these data, the attibutes are freezed…

Exist any way to delete this and the DFF can be modified ?

Best Regards to all,

Carlos Martínez