diff --git a/src/main/java/cz/cvut/kbss/analysis/controller/FaultTreeController.java b/src/main/java/cz/cvut/kbss/analysis/controller/FaultTreeController.java
index 2c01b6e..470976f 100755
--- a/src/main/java/cz/cvut/kbss/analysis/controller/FaultTreeController.java
+++ b/src/main/java/cz/cvut/kbss/analysis/controller/FaultTreeController.java
@@ -4,6 +4,7 @@
 import cz.cvut.kbss.analysis.model.opdata.OperationalDataFilter;
  import cz.cvut.kbss.analysis.service.FaultTreeEvaluationService;
 import cz.cvut.kbss.analysis.service.FaultTreeRepositoryService;
+import cz.cvut.kbss.analysis.service.FaultTreeService;
 import cz.cvut.kbss.analysis.service.IdentifierService;
 import cz.cvut.kbss.analysis.util.Vocabulary;
 import cz.cvut.kbss.jsonld.JsonLd;
@@ -27,6 +28,7 @@ public class FaultTreeController {
     private final FaultTreeRepositoryService repositoryService;
     private final FaultTreeEvaluationService faultTreeEvaluationService;
     private final IdentifierService identifierService;
+    private final FaultTreeService faultTreeService;
 
     @GetMapping
     public List<FaultTree> findAll() {
@@ -42,7 +44,7 @@ public List<FaultTree> summaries() {
     public FaultTree find(@PathVariable(name = "faultTreeFragment") String faultTreeFragment) {
         log.info("> find - {}", faultTreeFragment);
         URI faultTreeUri = identifierService.composeIdentifier(Vocabulary.s_c_fault_tree, faultTreeFragment);
-        return repositoryService.findWithDetails(faultTreeUri);
+        return faultTreeService.findWithDetails(faultTreeUri);
     }
 
     @ResponseStatus(HttpStatus.CREATED)
diff --git a/src/main/java/cz/cvut/kbss/analysis/service/FaultTreeRepositoryService.java b/src/main/java/cz/cvut/kbss/analysis/service/FaultTreeRepositoryService.java
index 5e9a02b..9207466 100755
--- a/src/main/java/cz/cvut/kbss/analysis/service/FaultTreeRepositoryService.java
+++ b/src/main/java/cz/cvut/kbss/analysis/service/FaultTreeRepositoryService.java
@@ -43,7 +43,6 @@ public class FaultTreeRepositoryService extends ComplexManagedEntityRepositorySe
     private final ThreadLocal<Set<Behavior>> visitedBehaviors = new ThreadLocal<>();
     private final FaultEventDao faultEventDao;
     private final OperationalDataFilterService operationalDataFilterService;
-    private final FailureModeDao failureModeDao;
     private final OperationalDataService operationalDataService;
     private final FaultEventTypeService faultEventTypeService;
     private final FailureRateEstimateDao failureRateEstimateDao;
@@ -59,7 +58,6 @@ public FaultTreeRepositoryService(@Qualifier("defaultValidator") Validator valid
                                       SecurityUtils securityUtils,
                                       FaultEventDao faultEventDao,
                                       OperationalDataFilterService operationalDataFilterService,
-                                      FailureModeDao failureModeDao,
                                       OperationalDataService operationalDataService,
                                       FaultEventTypeService faultEventTypeService,
                                       FailureRateEstimateDao failureRateEstimateDao) {
@@ -71,7 +69,6 @@ public FaultTreeRepositoryService(@Qualifier("defaultValidator") Validator valid
         this.identifierService = identifierService;
         this.faultEventDao = faultEventDao;
         this.operationalDataFilterService = operationalDataFilterService;
-        this.failureModeDao = failureModeDao;
         this.operationalDataService = operationalDataService;
         this.faultEventTypeService = faultEventTypeService;
         this.failureRateEstimateDao = failureRateEstimateDao;
@@ -103,34 +100,9 @@ public void createTree(FaultTree faultTree){
         persist(faultTree);
     }
 
-    protected void setRelatedBehaviors(Collection<Event> events){
-        for(Event event : events){
-            if(event.getBehavior() == null)
-                event.setBehavior(failureModeDao.findByEvent(event.getUri()));
-        }
-    }
-
-    public FaultTree findWithDetails(URI id) {
-        FaultTree ft = findRequired(id);
-
-        Collection<Event> events = faultTreeDao.getRelatedEventTypes(ft);
-        setRelatedBehaviors(events);
-
-        events.stream().map(e -> e.getBehavior()).forEach(b -> {
-            Item item = b.getItem();
-            if(item == null)
-                return;
-
-            item.setComponents(null);
-            Optional.ofNullable(item.getSupertypes()).ifPresent( s -> s.forEach(st -> st.setComponents(null)));
-        });
-
-        setReferences(ft);
-
-        FaultTree summary = findSummary(ft.getUri());
-        ft.setOperationalDataFilter(summary.getOperationalDataFilter());
-
-        return ft;
+    @Transactional
+    public FaultTree findRequired(URI id) {
+        return super.findRequired(id);
     }
 
     public FaultTree findSummary(URI faultTreeUri){
@@ -152,22 +124,6 @@ public List<FaultTree> findAllSummaries(){
         return summaries;
     }
 
-    public void setReferences(FaultTree faultTree){
-        if(faultTree.getManifestingEvent() == null)
-            return;
-
-        Stack<Pair<URI,FaultEvent>> stack = new Stack<>();
-        stack.add(Pair.of(null,faultTree.getManifestingEvent()));
-        while(!stack.isEmpty()){
-            Pair<URI,FaultEvent> p = stack.pop();
-            FaultEvent fe = p.getSecond();
-            faultEventRepositoryService.setExternalReference(p.getFirst(), fe);
-            if(fe.getChildren() == null)
-                continue;
-            fe.getChildren().forEach(c -> stack.push(Pair.of(fe.getUri(), c)));
-        }
-    }
-
     @Transactional
     public FaultTree findWithPropagation(URI faultTreeUri) {
         log.info("> findWithPropagation - {}", faultTreeUri);
diff --git a/src/main/java/cz/cvut/kbss/analysis/service/FaultTreeService.java b/src/main/java/cz/cvut/kbss/analysis/service/FaultTreeService.java
new file mode 100644
index 0000000..47ddcad
--- /dev/null
+++ b/src/main/java/cz/cvut/kbss/analysis/service/FaultTreeService.java
@@ -0,0 +1,80 @@
+package cz.cvut.kbss.analysis.service;
+
+import cz.cvut.kbss.analysis.dao.FailureModeDao;
+import cz.cvut.kbss.analysis.dao.FaultTreeDao;
+import cz.cvut.kbss.analysis.model.Event;
+import cz.cvut.kbss.analysis.model.FaultEvent;
+import cz.cvut.kbss.analysis.model.FaultTree;
+import cz.cvut.kbss.analysis.model.Item;
+import cz.cvut.kbss.analysis.service.util.Pair;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+
+import java.net.URI;
+import java.util.Collection;
+import java.util.Optional;
+import java.util.Stack;
+
+@Service
+@Slf4j
+public class FaultTreeService{
+
+    private final FaultEventRepositoryService faultEventRepositoryService;
+    private final FailureModeDao failureModeDao;
+    private final FaultTreeRepositoryService faultTreeRepositoryService;
+    private final FaultTreeDao faultTreeDao;
+
+    public FaultTreeService(FaultEventRepositoryService faultEventRepositoryService, FailureModeDao failureModeDao, FaultTreeRepositoryService faultTreeRepositoryService, FaultTreeDao faultTreeDao) {
+        this.faultEventRepositoryService = faultEventRepositoryService;
+        this.failureModeDao = failureModeDao;
+        this.faultTreeRepositoryService = faultTreeRepositoryService;
+        this.faultTreeDao = faultTreeDao;
+    }
+
+    public FaultTree findWithDetails(URI id) {
+        FaultTree ft = faultTreeRepositoryService.findRequired(id);
+        Collection<Event> events = faultTreeDao.getRelatedEventTypes(ft);
+        setRelatedBehaviors(events);
+
+        events.stream().map(e -> e.getBehavior()).forEach(b -> {
+            Item item = b.getItem();
+            if(item == null)
+                return;
+
+            item.setComponents(null);
+            Optional.ofNullable(item.getSupertypes()).ifPresent(s -> s.forEach(st -> st.setComponents(null)));
+        });
+
+        setReferences(ft);
+
+        FaultTree summary = faultTreeRepositoryService.findSummary(ft.getUri());
+        ft.setOperationalDataFilter(summary.getOperationalDataFilter());
+        ft.setSystem(summary.getSystem());
+        ft.setSubsystem(summary.getSubsystem());
+
+        return ft;
+    }
+
+    protected void setReferences(FaultTree faultTree){
+        if(faultTree.getManifestingEvent() == null)
+            return;
+
+        Stack<Pair<URI, FaultEvent>> stack = new Stack<>();
+        stack.add(Pair.of(null,faultTree.getManifestingEvent()));
+        while(!stack.isEmpty()){
+            Pair<URI,FaultEvent> p = stack.pop();
+            FaultEvent fe = p.getSecond();
+            faultEventRepositoryService.setExternalReference(p.getFirst(), fe);
+            if(fe.getChildren() == null)
+                continue;
+            fe.getChildren().forEach(c -> stack.push(Pair.of(fe.getUri(), c)));
+        }
+    }
+
+    protected void setRelatedBehaviors(Collection<Event> events){
+        for(Event event : events){
+            if(event.getBehavior() == null)
+                event.setBehavior(failureModeDao.findByEvent(event.getUri()));
+        }
+    }
+}