diff --git a/crates/oa-desktop/src/app/traceability_navigation_tests.rs b/crates/oa-desktop/src/app/traceability_navigation_tests.rs
index 80b34948..e9558874 100644
--- a/crates/oa-desktop/src/app/traceability_navigation_tests.rs
+++ b/crates/oa-desktop/src/app/traceability_navigation_tests.rs
@@ -175,9 +175,11 @@ fn mixed_view_show_keeps_its_context_for_every_diagram_app_and_target_layer() {
                 let before = app.project().clone();
                 let action = show_action(&mut app, target);
                 send(&mut app, action);
+                // The existing RevealInDiagram action synchronizes the layer
+                // to the captured view, even if the prior perspective differed.
                 assert_eq!(
                     (app.active_diagram, app.layer, app.selected),
-                    (Some(mixed), app_layer, target)
+                    (Some(mixed), diagram_layer, target)
                 );
                 let added = app.project().diagrams[&mixed]
                     .nodes
@@ -185,6 +187,7 @@ fn mixed_view_show_keeps_its_context_for_every_diagram_app_and_target_layer() {
                     .find(|n| n.element == target)
                     .unwrap()
                     .clone();
+                assert_eq!(app.selected_node, Some(added.id));
                 let mut expected = before;
                 expected
                     .diagrams
diff --git a/harness/traceability-view-20260923.md b/harness/traceability-view-20260923.md
index 2724e363..13f76426 100644
--- a/harness/traceability-view-20260923.md
+++ b/harness/traceability-view-20260923.md
@@ -64,8 +64,9 @@ ordinary OA/SA edges, multiple traces, explicit hides plus disabled Trace kind,
 port owners and relation correspondence. Do not infer visible lines from
 unfiltered edge_availability or confuse unrelated model traces with counterparts.
 
-Native acceptance must start with an OA-only view and existing named SA
-counterpart, find/place it through the visible controls, see/select the trace,
+Native acceptance starts with an OA-owned mixed view, one already visible
+correspondence pair and another existing named SA counterpart not yet placed.
+Find/place it through the visible controls, see/select the additional trace,
 inspect an absent-line visibility reason, Undo/Redo and Save/reopen. Inspect
 toolbar/canvas space and chooser clarity at a realistic window size. Different
 help text or count tests alone do not resolve the user's comprehension complaint.