diff --git a/crates/oa-core/tests/lead_feasibility.rs b/crates/oa-core/tests/lead_feasibility.rs
index c7ec5877..36069d1c 100644
--- a/crates/oa-core/tests/lead_feasibility.rs
+++ b/crates/oa-core/tests/lead_feasibility.rs
@@ -18,6 +18,11 @@ fn fixture(ports: bool, gap: f32) -> Fixture {
     let a = p.add_element(kind, Layer::Sa, "Source", None).unwrap();
     let b = p.add_element(kind, Layer::Sa, "Target", None).unwrap();
     let c = p.add_element(kind, Layer::Sa, "Blocker", None).unwrap();
+    for element in p.elements.values_mut() {
+        if let Some(SharedBody::DataType { definition, .. }) = element.shared_mut() {
+            *definition = DataTypeDefinition::Record { supertype: None };
+        }
+    }
     let edge = p.relate(
         if ports {
             RelationKind::FunctionalExchange