Relation reference widget: filter expression does not work with variables · Issue #48190 · qgis/QGIS · GitHub
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![expression] relation_aggregate has no filter option but order_by · Issue #36842 · qgis/QGIS · GitHub](https://user-images.githubusercontent.com/7631137/83337293-63311800-a2ba-11ea-87a9-bf7bf3ee259b.png "expression] relation_aggregate has no filter option but order_by · Issue #36842 · qgis/QGIS · GitHub")
expression] relation_aggregate has no filter option but order_by · Issue #36842 · qgis/QGIS · GitHub
attribute table - QGIS: Using Filter expression for Drop Down Lists in Value Relation Widget - Geographic Information Systems Stack Exchange
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