Decode and Fix: “This Data Type is Unsupported for Evaluation” in Power Apps
One common frustration when building Canvas Apps over Dataverse is encountering this cryptic error: “This data type is unsupported for evaluation” This message typically appears when Power Apps cannot process or render a specific Dataverse column type within a control or formula. While it may seem vague, it’s usually tied to specific patterns involving complex column types or runtime data structure mismatches. In this blog, we'll explore common causes, scenarios, and practical fixes from both a developer and architectural standpoint. Root Causes of the Error 1. Polymorphic Lookups Dataverse supports polymorphic relationships (e.g., `Owner`, `Customer`, `Regarding`) that can point to multiple entity types. These lookups can't be directly evaluated in Power Apps unless you cast the reference explicitly. Use: If( IsType(ThisItem.Customer, Account), AsType(ThisItem.Customer, Account).Name, AsType(ThisItem.Customer, Contact).FullName ) 2....
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