diff --git a/cdlang/src/main/java/de/monticore/cd4analysis/cocos/CD4AnalysisCoCos.java b/cdlang/src/main/java/de/monticore/cd4analysis/cocos/CD4AnalysisCoCos.java
index 804bbfefd..88b31703e 100644
--- a/cdlang/src/main/java/de/monticore/cd4analysis/cocos/CD4AnalysisCoCos.java
+++ b/cdlang/src/main/java/de/monticore/cd4analysis/cocos/CD4AnalysisCoCos.java
@@ -3,6 +3,7 @@
 
 import de.monticore.cd.cocos.CoCoParent;
 import de.monticore.cd4analysis._cocos.CD4AnalysisCoCoChecker;
+import de.monticore.cd4analysis.cocos.ebnf.CDAssociationValidRoleSymbolsInScope;
 
 public class CD4AnalysisCoCos extends CoCoParent<CD4AnalysisCoCoChecker> {
   @Override
@@ -16,4 +17,9 @@ protected void addCheckerForAllCoCos(CD4AnalysisCoCoChecker checker) {
     addCheckerForMcgCoCos(checker);
     addCheckerForMcg2EbnfCoCos(checker);
   }
+  
+  @Override
+  protected void addEbnfCoCos(CD4AnalysisCoCoChecker checker) {
+    checker.addCoCo(new CDAssociationValidRoleSymbolsInScope());
+  }
 }
diff --git a/cdlang/src/main/java/de/monticore/cd4analysis/cocos/ebnf/CDAssociationValidRoleSymbolsInScope.java b/cdlang/src/main/java/de/monticore/cd4analysis/cocos/ebnf/CDAssociationValidRoleSymbolsInScope.java
new file mode 100644
index 000000000..f6953a805
--- /dev/null
+++ b/cdlang/src/main/java/de/monticore/cd4analysis/cocos/ebnf/CDAssociationValidRoleSymbolsInScope.java
@@ -0,0 +1,72 @@
+/* (c) https://github.com/MontiCore/monticore */
+package de.monticore.cd4analysis.cocos.ebnf;
+
+import de.monticore.cdassociation._ast.ASTCDAssociation;
+import de.monticore.cdassociation._symboltable.CDRoleSymbol;
+import de.monticore.cdbasis._ast.ASTCDDefinition;
+import de.monticore.cdbasis._cocos.CDBasisASTCDDefinitionCoCo;
+import de.se_rwth.commons.logging.Log;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * This CoCo checks for the usage of identical role names across multiple
+ * associations for a given reference type. The presence of duplicate role
+ * names can lead to ambiguity when accessing the referenced elements,
+ * and results in incomplete storage of CDRoleSymbols within the
+ * scope and symbol table.
+ * <p>
+ * This CoCo only considers the roles of an isolated reference type, as this
+ * serves as the fundamental basis. More in-depth CoCos use the symbol table
+ * and are faulty if it is faulty.
+ * <p>
+ * Example:
+ * <pre>
+ * class Person {
+ * }
+ * association knows [1] Person -> Person [*];
+ * </pre>
+ * Since no explicit role names were provided, the name of the reference type (in lowercase)
+ * is used as the role name. Since this is identical in both cases, only one of the two
+ * CDRoleSymbols is stored in the scope of the Person type.
+ */
+public class CDAssociationValidRoleSymbolsInScope implements CDBasisASTCDDefinitionCoCo {
+  
+  @Override
+  public void check(ASTCDDefinition definition) {
+    // maps class to all contained role names
+    Map<String, List<String>> knownRoleNames = new HashMap<>();
+    for (ASTCDAssociation assoc : definition.getCDAssociationsList()) {
+      // left side
+      CDRoleSymbol rightRoleSymbol = assoc.getRight().getSymbol();
+      String leftTypeFQN = assoc.getLeftQualifiedName().getQName();
+      knownRoleNames.putIfAbsent(leftTypeFQN, new ArrayList<>());
+      
+      if (knownRoleNames.get(leftTypeFQN).contains(rightRoleSymbol.getName())) {
+        Log.error("0xCDCE4: Duplicate role (" + rightRoleSymbol.getName() + ") in reference Type "
+                + assoc.getLeft().getMCQualifiedType().printType(),
+            rightRoleSymbol.getSourcePosition());
+      }
+      else {
+        knownRoleNames.get(leftTypeFQN).add(rightRoleSymbol.getName());
+      }
+      
+      // right side
+      CDRoleSymbol leftRoleSymbol = assoc.getLeft().getSymbol();
+      String rightTypeFQN = assoc.getRightQualifiedName().getQName();
+      knownRoleNames.putIfAbsent(rightTypeFQN, new ArrayList<>());
+      
+      if (knownRoleNames.get(rightTypeFQN).contains(leftRoleSymbol.getName())) {
+        Log.error("0xCDCE4: Duplicate role (" + leftRoleSymbol.getName() + ") in reference Type "
+                + assoc.getRight().getMCQualifiedType().printType(),
+            leftRoleSymbol.getSourcePosition());
+      }
+      else {
+        knownRoleNames.get(rightTypeFQN).add(leftRoleSymbol.getName());
+      }
+    }
+  }
+}
diff --git a/cdlang/src/main/java/de/monticore/cdassociation/_symboltable/CDAssociationSymbolTableCompleter.java b/cdlang/src/main/java/de/monticore/cdassociation/_symboltable/CDAssociationSymbolTableCompleter.java
index ea10dce79..37695a546 100644
--- a/cdlang/src/main/java/de/monticore/cdassociation/_symboltable/CDAssociationSymbolTableCompleter.java
+++ b/cdlang/src/main/java/de/monticore/cdassociation/_symboltable/CDAssociationSymbolTableCompleter.java
@@ -166,6 +166,8 @@ public static void addRoleToTheirType(CDRoleSymbol symbol, TypeSymbol otherType)
     if (!spannedScope.getCDRoleSymbols().containsKey(symbol.getName())) {
       // add the symbol to the type; add to all relevant lists
       spannedScope.add(symbol);
+    } else {
+      Log.warn("0xCDCE5: Ignored duplicate role symbol (" + symbol.getName()+") for reference Type "+otherType.getFullName(), symbol.getSourcePosition());
     }
   }
 
diff --git a/cdlang/src/test/java/de/monticore/cd4analysis/cocos/ebnf/CDAssociationValidRoleSymbolInScopeTest.java b/cdlang/src/test/java/de/monticore/cd4analysis/cocos/ebnf/CDAssociationValidRoleSymbolInScopeTest.java
new file mode 100644
index 000000000..c56f6e3ca
--- /dev/null
+++ b/cdlang/src/test/java/de/monticore/cd4analysis/cocos/ebnf/CDAssociationValidRoleSymbolInScopeTest.java
@@ -0,0 +1,58 @@
+package de.monticore.cd4analysis.cocos.ebnf;
+
+import de.monticore.cd4analysis.CD4AnalysisTestBasis;
+import de.monticore.cdbasis._ast.ASTCDCompilationUnit;
+import de.se_rwth.commons.logging.Log;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class CDAssociationValidRoleSymbolInScopeTest extends CD4AnalysisTestBasis {
+  
+  @Test
+  public void testValid() throws IOException {
+    String modelPath = "cd4analysis/cocos/CDAssociationValidRoleSymbolInScope.cd";
+    
+    coCoChecker.addCoCo(new CDAssociationValidRoleSymbolsInScope());
+    ASTCDCompilationUnit ast = parse(modelPath);
+    prepareST(ast);
+    
+    coCoChecker.checkAll(ast);
+    assertEquals(0, Log.getFindings().size());
+  }
+  
+  @Test
+  public void testInvalid() throws IOException {
+    String modelPath = "cd4analysis/cocos/CDAssociationValidRoleSymbolInScopeInvalid.cd";
+    
+    coCoChecker.addCoCo(new CDAssociationValidRoleSymbolsInScope());
+    ASTCDCompilationUnit ast = parse(modelPath);
+    prepareST(ast);
+    
+    coCoChecker.checkAll(ast);
+    assertEquals(2, Log.getFindings().size());
+    assertTrue(Log.getFindings().get(0).getMsg().startsWith("0xCDCE5"));
+    assertTrue(Log.getFindings().get(1).getMsg().startsWith("0xCDCE4"));
+    Log.clearFindings();
+  }
+  
+  @Test
+  public void testInvalid2() throws IOException {
+    String modelPath = "cd4analysis/cocos/CDAssociationValidRoleSymbolInScopeInvalid2.cd";
+    
+    coCoChecker.addCoCo(new CDAssociationValidRoleSymbolsInScope());
+    ASTCDCompilationUnit ast = parse(modelPath);
+    prepareST(ast);
+    
+    coCoChecker.checkAll(ast);
+    assertEquals(4, Log.getFindings().size());
+    assertTrue(Log.getFindings().get(0).getMsg().startsWith("0xCDCE5"));
+    assertTrue(Log.getFindings().get(1).getMsg().startsWith("0xCDCE5"));
+    assertTrue(Log.getFindings().get(2).getMsg().startsWith("0xCDCE4"));
+    assertTrue(Log.getFindings().get(3).getMsg().startsWith("0xCDCE4"));
+    Log.clearFindings();
+  }
+}
diff --git a/cdlang/src/test/resources/de/monticore/cd4analysis/cocos/CDAssociationValidRoleSymbolInScope.cd b/cdlang/src/test/resources/de/monticore/cd4analysis/cocos/CDAssociationValidRoleSymbolInScope.cd
new file mode 100644
index 000000000..034401105
--- /dev/null
+++ b/cdlang/src/test/resources/de/monticore/cd4analysis/cocos/CDAssociationValidRoleSymbolInScope.cd
@@ -0,0 +1,11 @@
+/* (c) https://github.com/MontiCore/monticore */
+
+classdiagram CDAssociationValidRoleSymbolInScope {
+
+  class Person {
+    public String fullName;
+    int age;
+  }
+
+  association marriage [1] Person (partnerOpposite) <-> (partner) Person [1];
+}
\ No newline at end of file
diff --git a/cdlang/src/test/resources/de/monticore/cd4analysis/cocos/CDAssociationValidRoleSymbolInScopeInvalid.cd b/cdlang/src/test/resources/de/monticore/cd4analysis/cocos/CDAssociationValidRoleSymbolInScopeInvalid.cd
new file mode 100644
index 000000000..e18f9a4fe
--- /dev/null
+++ b/cdlang/src/test/resources/de/monticore/cd4analysis/cocos/CDAssociationValidRoleSymbolInScopeInvalid.cd
@@ -0,0 +1,11 @@
+/* (c) https://github.com/MontiCore/monticore */
+
+classdiagram CDAssociationValidRoleSymbolInScopeInvalid {
+
+  class Person {
+    public String fullName;
+    int age;
+  }
+
+  association marriage [1] Person <-> Person [1];
+}
\ No newline at end of file
diff --git a/cdlang/src/test/resources/de/monticore/cd4analysis/cocos/CDAssociationValidRoleSymbolInScopeInvalid2.cd b/cdlang/src/test/resources/de/monticore/cd4analysis/cocos/CDAssociationValidRoleSymbolInScopeInvalid2.cd
new file mode 100644
index 000000000..a7a846e51
--- /dev/null
+++ b/cdlang/src/test/resources/de/monticore/cd4analysis/cocos/CDAssociationValidRoleSymbolInScopeInvalid2.cd
@@ -0,0 +1,12 @@
+/* (c) https://github.com/MontiCore/monticore */
+
+classdiagram CDAssociationValidRoleSymbolInScopeInvalid2 {
+
+  class Person {
+    public String fullName;
+    int age;
+  }
+
+  association mother [1] Person <-> (child) Person [1];
+  association father [1] Person <-> (child) Person [1];
+}
\ No newline at end of file
diff --git a/cdlang/src/test/resources/de/monticore/cd4analysis/examples/industrial_strength_models/InviDas.cd b/cdlang/src/test/resources/de/monticore/cd4analysis/examples/industrial_strength_models/InviDas.cd
index 8f5819b44..a09a9a4d4 100644
--- a/cdlang/src/test/resources/de/monticore/cd4analysis/examples/industrial_strength_models/InviDas.cd
+++ b/cdlang/src/test/resources/de/monticore/cd4analysis/examples/industrial_strength_models/InviDas.cd
@@ -111,7 +111,7 @@ classdiagram InviDas {
     String name;
   }
 
-  association DataEntry -> DataEntry [*];
+  association DataEntry -> (linked) DataEntry [*];
   association DataEntry -> DataCategory [*];
 
   /*************************************************************************************************
diff --git a/cdlang/src/test/resources/de/monticore/cd4analysis/examples/industrial_strength_models/MaCoCo.cd b/cdlang/src/test/resources/de/monticore/cd4analysis/examples/industrial_strength_models/MaCoCo.cd
index e90e35bd4..41591fcfc 100644
--- a/cdlang/src/test/resources/de/monticore/cd4analysis/examples/industrial_strength_models/MaCoCo.cd
+++ b/cdlang/src/test/resources/de/monticore/cd4analysis/examples/industrial_strength_models/MaCoCo.cd
@@ -24,8 +24,8 @@ classdiagram MaCoCo {
   }
 
   association [1] Konto (konto) <-> (gesamtBudget) Budget [0..1];
-  association [1] Konto -> (kommentare) Freitext [*];
-  association [1] Konto -> (notiz) Freitext [0..1];
+  association [1] Konto (kommentiert) -> (kommentare) Freitext [*];
+  association [1] Konto (annotiert) -> (notiz) Freitext [0..1];
   association [1] Konto <-> MailAlert [*];
   association [1] Konto -> (abgleichsKonto) ExternKonto [0..1];
 
diff --git a/cdtool/src/test/java/de/monticore/CDDiffCLIToolTest.java b/cdtool/src/test/java/de/monticore/CDDiffCLIToolTest.java
index 9b63644c1..cd39e1289 100644
--- a/cdtool/src/test/java/de/monticore/CDDiffCLIToolTest.java
+++ b/cdtool/src/test/java/de/monticore/CDDiffCLIToolTest.java
@@ -33,11 +33,11 @@ public void init() {
 
   @Test
   public void testChain() {
-    final String cd1 = TOOL_PATH + "cddiff/Employees/Employees2.cd";
-    final String cd2 = TOOL_PATH + "cddiff/Employees/Employees1.cd";
+    final String cd1 = TOOL_PATH + "cddiff/Employees/Employees10.cd";
+    final String cd2 = TOOL_PATH + "cddiff/Employees/Employees9.cd";
     final String output = "./target/generated/chain";
     String[] args = {
-      "-i", cd1, "--merge", cd2, "--semdiff", cd2, "-o", output, "-pp", "Employees12.cd"
+      "-i", cd1, "--merge", cd2, "--semdiff", cd2, "-o", output, "-pp", "Employees910.cd"
     };
     CD4CodeTool.main(args);
 
diff --git a/cdtool/src/test/resources/de/monticore/cddiff/Employees/Employees10.cd b/cdtool/src/test/resources/de/monticore/cddiff/Employees/Employees10.cd
new file mode 100644
index 000000000..a682690b4
--- /dev/null
+++ b/cdtool/src/test/resources/de/monticore/cddiff/Employees/Employees10.cd
@@ -0,0 +1,21 @@
+/* (c) https://github.com/MontiCore/monticore */
+
+import java.util.Date;
+import java.lang.String;
+
+classdiagram Employees10 {
+  enum PositionKind{fullTime, partTime, external;}
+
+  class Employee {
+    PositionKind kind;
+  }
+
+  class Task {
+    Date startDate;
+  }
+
+  class Manager extends Employee;
+
+  association [*] Employee (manages) -> (managedBy) Manager [0..1];
+  association [1] Employee (priorityTask) -- (createdBy) Task [0..1];
+}
diff --git a/cdtool/src/test/resources/de/monticore/cddiff/Employees/Employees9.cd b/cdtool/src/test/resources/de/monticore/cddiff/Employees/Employees9.cd
new file mode 100644
index 000000000..c8077269c
--- /dev/null
+++ b/cdtool/src/test/resources/de/monticore/cddiff/Employees/Employees9.cd
@@ -0,0 +1,20 @@
+/* (c) https://github.com/MontiCore/monticore */
+
+import java.util.Date;
+
+classdiagram Employees9 {
+  enum PositionKind{fullTime, partTime;}
+
+  class Employee {
+    PositionKind kind;
+  }
+
+  class Task {
+    Date startDate;
+  }
+
+  class Manager;
+
+  association [*] Employee (manages) -> (managedBy) Manager [0..1];
+  association [1] Employee (tasks) -- (assignedTo)  Task [*];
+}