diff --git a/crates/oa-core/src/scenario_layout/tests.rs b/crates/oa-core/src/scenario_layout/tests.rs
index 2251fa7b..5cb61cdd 100644
--- a/crates/oa-core/src/scenario_layout/tests.rs
+++ b/crates/oa-core/src/scenario_layout/tests.rs
@@ -1,6 +1,7 @@
 use super::*;
 use crate::{
     Element, FragmentOperator, MessageKind, ProjectionKind, Relation, RelationBody, RelationKind,
+    ScenarioViewpoint,
 };
 use std::collections::BTreeMap;
 
@@ -73,6 +74,12 @@ fn fixture() -> Fixture {
     let owner = project
         .add_element(Kind::Scenario, Layer::Oa, "Nominal", None)
         .unwrap();
+    let Some(SharedBody::Scenario { viewpoint, .. }) =
+        project.elements.get_mut(&owner).unwrap().shared_mut()
+    else {
+        panic!("Scenario fixture body");
+    };
+    *viewpoint = ScenarioViewpoint::ParticipantInteraction;
     let performer = project
         .add_element(Kind::Entity, Layer::Oa, "Controller", None)
         .unwrap();
@@ -721,6 +728,12 @@ fn a_real_scenario_use_never_imports_its_called_message_as_a_direct_target() {
         .project
         .add_element(Kind::Scenario, Layer::Oa, "Called sequence", None)
         .unwrap();
+    let Some(SharedBody::Scenario { viewpoint, .. }) =
+        f.project.elements.get_mut(&called).unwrap().shared_mut()
+    else {
+        panic!("Called Scenario fixture body");
+    };
+    *viewpoint = ScenarioViewpoint::ParticipantInteraction;
     let called_message = f
         .project
         .add_element(Kind::Occurrence, Layer::Oa, "Called delivery", Some(called))