diff --git a/cdlang/src/main/java/de/monticore/cdgen/cocos/CDAssociationReferenceUnique.java b/cdlang/src/main/java/de/monticore/cdgen/cocos/CDAssociationReferenceUnique.java
new file mode 100644
index 000000000..c1d4af6ec
--- /dev/null
+++ b/cdlang/src/main/java/de/monticore/cdgen/cocos/CDAssociationReferenceUnique.java
@@ -0,0 +1,102 @@
+/* (c) https://github.com/MontiCore/monticore */
+package de.monticore.cdgen.cocos;
+
+import de.monticore.cdassociation._ast.ASTCDAssocSide;
+import de.monticore.cdassociation._ast.ASTCDAssociation;
+import de.monticore.cdbasis._ast.ASTCDDefinition;
+import de.monticore.cdbasis._ast.ASTCDType;
+import org.apache.commons.lang3.StringUtils;
+
+import java.util.*;
+
+/**
+ * Checks that generated association references are unique.
+ */
+public class CDAssociationReferenceUnique extends CDAssociationUniqueInHierarchy {
+
+  @Override
+  public void check(ASTCDDefinition node) {
+    List<ASTCDAssociation> alreadyChecked = new ArrayList<>();
+
+    // we check for each pair of associations
+    for (ASTCDAssociation assoc2 : node.getCDAssociationsList()) {
+      for (ASTCDAssociation assoc1 : alreadyChecked) {
+        for (AssociationReference ref1 : getAssociationReferences(assoc1)) {
+          for (AssociationReference ref2 : getAssociationReferences(assoc2)) {
+            if (ref1.name.equals(ref2.name)) {
+              checkRef(node, ref1.sourceType, ref2.sourceType, assoc2);
+            }
+          }
+        }
+      }
+
+      alreadyChecked.add(assoc2);
+    }
+  }
+
+  @Override
+  protected void checkRef(ASTCDDefinition node, ASTCDType type1, ASTCDType type2,
+      ASTCDAssociation assoc1) {
+    if (type1 == null || type2 == null) {
+      return;
+    }
+    super.checkRef(node, type1, type2, assoc1);
+  }
+
+  protected List<AssociationReference> getAssociationReferences(ASTCDAssociation assoc) {
+    List<AssociationReference> references = new ArrayList<>();
+
+    boolean navigableLeft = assoc.getCDAssocDir().isDefinitiveNavigableLeft();
+    boolean navigableRight = assoc.getCDAssocDir().isDefinitiveNavigableRight();
+    boolean undirected = !navigableLeft && !navigableRight;
+
+    if (navigableRight || undirected) {
+      references.add(new AssociationReference(findTypeByFullName(assoc, assoc.getLeftQualifiedName()
+          .getQName()), deriveReferenceName(assoc, AssocSide.RIGHT)));
+    }
+    if (navigableLeft || undirected) {
+      references.add(new AssociationReference(findTypeByFullName(assoc, assoc
+          .getRightQualifiedName().getQName()), deriveReferenceName(assoc, AssocSide.LEFT)));
+    }
+
+    return references;
+  }
+
+  protected String deriveReferenceName(ASTCDAssociation assoc, AssocSide side) {
+    ASTCDAssocSide assocSide;
+    if (side.equals(AssocSide.LEFT)) {
+      assocSide = assoc.getLeft();
+    }
+    else {
+      assocSide = assoc.getRight();
+    }
+    if (assoc.isPresentName()) {
+      return StringUtils.uncapitalize(assoc.getName());
+    }
+    else if (assocSide.isPresentCDRole()) {
+      return assocSide.getCDRole().getName();
+    }
+    else {
+      return StringUtils.uncapitalize(assocSide.getMCQualifiedType().getMCQualifiedName()
+          .getBaseName());
+    }
+  }
+
+  protected enum AssocSide {
+    LEFT, RIGHT;
+  }
+
+  protected static class AssociationReference {
+
+    protected final ASTCDType sourceType;
+
+    protected final String name;
+
+    protected AssociationReference(ASTCDType sourceType, String name) {
+      this.sourceType = sourceType;
+      this.name = name;
+    }
+
+  }
+
+}
diff --git a/cdlang/src/test/java/de/monticore/cdgen/cocos/CDAssociationReferenceUniqueTest.java b/cdlang/src/test/java/de/monticore/cdgen/cocos/CDAssociationReferenceUniqueTest.java
new file mode 100644
index 000000000..06ee230d0
--- /dev/null
+++ b/cdlang/src/test/java/de/monticore/cdgen/cocos/CDAssociationReferenceUniqueTest.java
@@ -0,0 +1,69 @@
+/* (c) https://github.com/MontiCore/monticore */
+package de.monticore.cdgen.cocos;
+
+import de.monticore.cd4code._cocos.CD4CodeCoCoChecker;
+import de.monticore.cd4code.cocos.AbstractJavaGenCoCoTest;
+import java.io.IOException;
+import org.junit.jupiter.api.Test;
+
+public class CDAssociationReferenceUniqueTest extends AbstractJavaGenCoCoTest {
+  
+  @Override
+  protected CD4CodeCoCoChecker createChecker() {
+    CD4CodeCoCoChecker checker = new CD4CodeCoCoChecker();
+    checker.addCoCo(new CDAssociationReferenceUnique());
+    return checker;
+  }
+  
+  private static final String ERROR_CODE = "0xCDCE1";
+  
+  @Test
+  public void testUniqueNames() throws IOException {
+    String model = "classdiagram UniqueAssocs {" + "  class A; class B;" + "  association A -> B;"
+        + "  association A (l) -> (r) B;" + "}";
+    runTest(model, false);
+  }
+  
+  @Test
+  public void testDuplicatesWithExplicitRoles() throws IOException {
+    String model = "classdiagram DuplicateAssocs {" + "  class A; class B;"
+        + "  association A -> B;" + "  association A -> (b) B;" + "}";
+    runTestForErrorCode(model, ERROR_CODE);
+  }
+  
+  @Test
+  public void testDuplicatesWithImplicitRoles() throws IOException {
+    String model = "classdiagram DuplicateAssocs {" + "  class A; class B;"
+        + "  association A -> B;" + "  association A -> B;" + "}";
+    runTestForErrorCode(model, ERROR_CODE);
+  }
+  
+  @Test
+  public void testUniqueExplicitRole() throws IOException {
+    String model = "classdiagram UniqueAssocs {" + "  class A; class B;" + "  association A -> B;"
+        + "  association A -> (other) B;" + "}";
+    runTest(model, false);
+  }
+  
+  @Test
+  public void testDuplicatesInReverse() throws IOException {
+    String model = "classdiagram DuplicateAssocs {" + "  class A; class B;"
+        + "  association A -> B;" + "  association B <- A;" + "}";
+    runTestForErrorCode(model, ERROR_CODE);
+  }
+  
+  @Test
+  public void testUniqueAssocName() throws IOException {
+    String model = "classdiagram UniqueAssocs {" + "  class A; class B;"
+        + "  association assoc1 A -> B;" + "  association assoc2 A -> B;" + "}";
+    runTest(model, false);
+  }
+  
+  @Test
+  public void testUniqueAssocNameWithSameRole() throws IOException {
+    String model = "classdiagram UniqueAssocs {" + "  class A; class B;"
+        + "  association assoc1 A -> (b) B;" + "  association assoc2 A -> (b) B;" + "}";
+    runTest(model, false);
+  }
+  
+}