diff --git a/src/normalization/normalize-landmark.js b/src/normalization/normalize-landmark.js
index 33be256..a4eca97 100644
--- a/src/normalization/normalize-landmark.js
+++ b/src/normalization/normalize-landmark.js
@@ -149,6 +149,7 @@ async function processSpatialEntities(context, metadata, gltfFile, cache, crossw
             label: `Global placement of ${landmarkLabel}`,
             class_type: 'SpatialPlacement',
             typeOf: ['SpatialPlacement'],
+            source: id,
             target: parentIri,
             x_scaling: 1,
             y_scaling: 1,
diff --git a/src/normalization/normalize-ref-organ.js b/src/normalization/normalize-ref-organ.js
index 8a09fd9..8e53747 100644
--- a/src/normalization/normalize-ref-organ.js
+++ b/src/normalization/normalize-ref-organ.js
@@ -164,6 +164,7 @@ async function processSpatialEntities(context, metadata, gltfFile, cache, crossw
             label: `Global placement of ${organLabel}`,
             class_type: 'SpatialPlacement',
             typeOf: ['SpatialPlacement'],
+            source: id,
             target: parentIri,
             placement_date: creationDate,
             x_scaling: 1,