Cannot see join search dialog fields within another's search criteria

I have a variable linked to a master entity (SupplierInvoiceLine). I have placed this variable on a form as a Join Search Dialog field. In the Display form, I have added two related master entities as Join Search Dialog fields (SupplierInvoice and SupplierMaster).In the web application, the two join search fields do not display as available Search Criteria, but they do show in the results. See attached.Shouldn't these fields be available in the search criteria as well?


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