diff --git a/lib/utils.js b/lib/utils.js
index 1929982..79fb2a3 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -220,6 +220,7 @@ const _getDataSubjectsMap = req => {
 
 const addDataSubjectForDetailsEntity = (row, log, req, entity, model) => {
   const dataSubjectInfo = getDataSubject(entity, model)
+  if (!dataSubjectInfo) debugger
   const role = dataSubjectInfo.dataSubjectEntity['@PersonalData.DataSubjectRole']
   log.data_subject.role ??= role
   log.data_subject.type = dataSubjectInfo.dataSubjectEntity.name
diff --git a/test/personal-data/crud.test.js b/test/personal-data/crud.test.js
index f4ee715..55b3be0 100644
--- a/test/personal-data/crud.test.js
+++ b/test/personal-data/crud.test.js
@@ -2146,4 +2146,19 @@ describe('personal data audit logging in CRUD', () => {
     await POST('/crud-5/A', { text: 'foo' }, { auth: ALICE })
     expect(_logs.length).toBe(1)
   })
+
+  test('triangle', async () => {
+    const { data: door } = await POST('/crud-5/Door', { text: 'door' }, { auth: ALICE })
+    try {
+      const { data: house } = await POST(
+        '/crud-5/House',
+        { text: 'house', doorID: door.ID, windows: [{ text: 'window' /* , doorID: door.ID */ }] },
+        { auth: ALICE }
+      )
+      expect(_logs.length).toBeGreaterThan(0) //> TODO
+    } catch (error) {
+      // current modeling leads to error during data subject lookup starting at Window
+      expect(error.response.status).toBe(500)
+    }
+  })
 })
diff --git a/test/personal-data/db/schema.cds b/test/personal-data/db/schema.cds
index 00fb757..8138d6b 100644
--- a/test/personal-data/db/schema.cds
+++ b/test/personal-data/db/schema.cds
@@ -183,3 +183,39 @@ annotate C with @PersonalData      : {EntitySemantics: 'DataSubject'} {
   ID   @PersonalData.FieldSemantics: 'DataSubjectID';
   text @PersonalData.IsPotentiallyPersonal;
 }
+
+entity House {
+  key ID      : UUID;
+      text    : String;
+      windows : Composition of many Window on windows.house = $self;
+      doorID  : UUID;
+      door    : Association to one Door on door.ID = doorID;
+}
+
+entity Window {
+  key ID     : UUID;
+      text   : String;
+      house  : Association to one House;
+      // doorID : UUID;
+      // door   : Association to one Door on door.ID = doorID;
+}
+
+entity Door {
+  key ID       : UUID;
+      text     : String;
+}
+
+annotate House with @PersonalData  : {EntitySemantics: 'Other'} {
+  door @PersonalData.FieldSemantics: 'DataSubjectID';
+  text @PersonalData.IsPotentiallyPersonal;
+}
+
+annotate Window with @PersonalData : {EntitySemantics: 'Other'} {
+  // door @PersonalData.FieldSemantics: 'DataSubjectID';
+  text @PersonalData.IsPotentiallyPersonal;
+}
+
+annotate Door with @PersonalData   : {EntitySemantics: 'DataSubject'} {
+  ID   @PersonalData.FieldSemantics: 'DataSubjectID';
+  text @PersonalData.IsPotentiallyPersonal;
+}
diff --git a/test/personal-data/srv/crud-5.js b/test/personal-data/srv/crud-5.js
new file mode 100644
index 0000000..8ad1050
--- /dev/null
+++ b/test/personal-data/srv/crud-5.js
@@ -0,0 +1,6 @@
+module.exports = srv => {
+  srv.on('*', async function(req, next) {
+    debugger
+    return next()
+  })
+}
diff --git a/test/personal-data/srv/crud-service.cds b/test/personal-data/srv/crud-service.cds
index 264e6f0..d17ef00 100644
--- a/test/personal-data/srv/crud-service.cds
+++ b/test/personal-data/srv/crud-service.cds
@@ -200,6 +200,7 @@ service CRUD_4 {
 }
 
 @path    : '/crud-5'
+@impl    : './crud-5.js'
 @requires: 'admin'
 service CRUD_5 {
 
@@ -207,4 +208,8 @@ service CRUD_5 {
   entity B                     as projection on db.B;
   entity C                     as projection on db.C;
 
+  entity House                 as projection on db.House;
+  entity Window                as projection on db.Window;
+  entity Door                  as projection on db.Door;
+
 }