How to filter requisition based on the context segment at header level

Summary:

I need to filter the requisitions created by the header context segment. Basically at now we defined two context segment called "Tipologia RDA" : "RDA Aperta", "RDA Chiusa" at header level (let see the screenshot attached).

The context is mandatory to save a requisition.

Could I filter for one of those values in the Process RequisitionPage or Manage Requisition Page?

How can I add this field as filter?

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