diff --git a/src/main/java/de/dhbwstuttgart/typeinference/unify/RuleSet.java b/src/main/java/de/dhbwstuttgart/typeinference/unify/RuleSet.java
index d120e483..5d60428b 100644
--- a/src/main/java/de/dhbwstuttgart/typeinference/unify/RuleSet.java
+++ b/src/main/java/de/dhbwstuttgart/typeinference/unify/RuleSet.java
@@ -13,6 +13,7 @@ import java.util.function.Function;
 import java.util.stream.Collectors;
 
 import de.dhbwstuttgart.exceptions.DebugException;
+import de.dhbwstuttgart.syntaxtree.type.ExtendsWildcardType;
 import de.dhbwstuttgart.typeinference.unify.interfaces.IFiniteClosure;
 import de.dhbwstuttgart.typeinference.unify.interfaces.IRuleSet;
 import de.dhbwstuttgart.typeinference.unify.model.ExtendsType;
@@ -390,26 +391,51 @@ public class RuleSet implements IRuleSet{
 		if((pair.getPairOp() != PairOperator.SMALLERDOT) && (pair.getPairOp() != PairOperator.SMALLERNEQDOT))
 			return false;
 		
-		if (pair.getPairOp() == PairOperator.SMALLERNEQDOT) {
-			UnifyType lhs = pair.getLhsType();
-			UnifyType rhs = pair.getRhsType();
-			if (lhs instanceof WildcardType) {
-				lhs = ((WildcardType)lhs).getWildcardedType();
-			}
-			if (rhs instanceof WildcardType) {
-				rhs = ((WildcardType)rhs).getWildcardedType();
-			}
-		
-			if	(lhs.equals(rhs)){
-				return false;
-			}
+		UnifyType lhsType = pair.getLhsType();
+		UnifyType rhsType = pair.getRhsType();
+			
+		/*
+		 * ty <. ? extends ty' is wrong	
+		 */
+		if (rhsType instanceof ExtendsType) {
+			return false;
+		}
+	
+		/*
+		 * ? super ty <. ty' is wrong
+		 * except Ty' = Object or ty' = ? super Object	
+		 */
+		if ((lhsType instanceof SuperType) && 
+				(!(rhsType.equals(new ReferenceType("java.lang.Object", false)))) &&
+				!(rhsType.equals(new SuperType (new ReferenceType("java.lang.Object", false))))) {
+			return false;
+		}
+		
+		/*
+		 * ? extends ty <. ty' is equivalent to ty < ty'
+		 */
+		if (lhsType instanceof ExtendsType) {
+				lhsType = ((WildcardType)lhsType).getWildcardedType();
+		}
+		
+		/*
+		 * ty <. ? super ty' ist equivalent to ty <. ty'
+		 */
+		if (rhsType instanceof SuperType) {
+			rhsType = ((WildcardType)rhsType).getWildcardedType();
+		}
+		
+		/*
+		 * SMALLERNEQDOT => type must not be equal
+		 */
+		if (pair.getPairOp() == PairOperator.SMALLERNEQDOT && lhsType.equals(rhsType)){
+			return false; 
 		}
 		
-		UnifyType lhsType = pair.getLhsType();
 		if(!(lhsType instanceof ReferenceType) && !(lhsType instanceof PlaceholderType))
 			return false;
 		
-		UnifyType rhsType = pair.getRhsType();
+		
 		if(!(rhsType instanceof ReferenceType) && !(rhsType instanceof PlaceholderType))
 			return false;
 		
diff --git a/src/test/java/targetast/TestComplete.java b/src/test/java/targetast/TestComplete.java
index b1773e15..e4391664 100644
--- a/src/test/java/targetast/TestComplete.java
+++ b/src/test/java/targetast/TestComplete.java
@@ -279,6 +279,12 @@ public class TestComplete {
         assertEquals(result, instanceOfClass_m3);
     }
 
+    @Test
+    public void scalarTest() throws Exception {
+        var classFiles = generateClassFiles("Scalar.jav", new ByteArrayClassLoader());
+        var scalar = classFiles.get("Scalar");
+    }
+
     @Test
     public void mergeTest() throws Exception {
         var classFiles = generateClassFiles("Merge.jav", new ByteArrayClassLoader());