diff --git a/src/fr/impl/CompatibilityManagerImpl.java b/src/fr/impl/CompatibilityManagerImpl.java
index 94b30e4..7b43a28 100644
--- a/src/fr/impl/CompatibilityManagerImpl.java
+++ b/src/fr/impl/CompatibilityManagerImpl.java
@@ -127,18 +127,49 @@ public class CompatibilityManagerImpl implements src.fr.api.CompatibilityManager
             }
         }
     }
+    
+    // A - incompatible B + B require C => A incompatbile C
+    // This is B require C
+    protected Set<PartType> getIncompability_middle(PartType reference){
+        return this.requirements.getOrDefault(reference, new HashSet<PartType>());
+    }
 
     @Override
     public Set<PartType> getIncompatibilities(PartType reference) {
         // Il faut verifier ref est existé dans Hashmap
         //return this.incompatibilities.get(reference);
+
+        //A incompatible B
+        Set<PartType> parts = this.incompatibilities.getOrDefault(reference, new HashSet<PartType>());
+
+        // A incompatible C
+        //Get all incomptability with transivity
+        if (parts != null){
+            for( PartType p: parts){
+                parts.addAll(this.getIncompability_middle(p));
+            }
+        }
+        return parts;
+    }
+
+
+    //Same but B incompatible C
+    protected Set<PartType> getRequirement_middle(PartType reference){
         return this.incompatibilities.getOrDefault(reference, new HashSet<PartType>());
     }
 
     @Override
     public Set<PartType> getRequirements(PartType reference) {
-        //return this.requirements.get(reference);
-        return this.requirements.getOrDefault(reference, new HashSet<PartType>());
+        Set<PartType> parts = this.requirements.getOrDefault(reference, new HashSet<PartType>());
+
+        // A incompatible C
+        //Get all incomptability with transivity
+        if (parts != null){
+            for( PartType p: parts){
+                parts.addAll(this.getRequirement_middle(p));
+            }
+        }
+        return parts;
     }
 
 }
\ No newline at end of file