diff --git a/org.fortiss.tooling.ext.reuse/src/org/fortiss/tooling/ext/reuse/.ratings b/org.fortiss.tooling.ext.reuse/src/org/fortiss/tooling/ext/reuse/.ratings
index 8fd98fd2d04b97fa3bb7a55145e9589c71db4fb1..da06f1f9f005d0cc2c68437bb55349018a7e3c0b 100644
--- a/org.fortiss.tooling.ext.reuse/src/org/fortiss/tooling/ext/reuse/.ratings
+++ b/org.fortiss.tooling.ext.reuse/src/org/fortiss/tooling/ext/reuse/.ratings
@@ -1 +1 @@
-ToolingReuseActivator.java 3a735e7e2c75e9b048f94bf1adeb172b83301639 GREEN
+ToolingReuseActivator.java 52b9208684334f60ee8c0bc074c86f06f6248227 GREEN
diff --git a/org.fortiss.tooling.ext.reuse/src/org/fortiss/tooling/ext/reuse/ToolingReuseActivator.java b/org.fortiss.tooling.ext.reuse/src/org/fortiss/tooling/ext/reuse/ToolingReuseActivator.java
index 3a735e7e2c75e9b048f94bf1adeb172b83301639..52b9208684334f60ee8c0bc074c86f06f6248227 100644
--- a/org.fortiss.tooling.ext.reuse/src/org/fortiss/tooling/ext/reuse/ToolingReuseActivator.java
+++ b/org.fortiss.tooling.ext.reuse/src/org/fortiss/tooling/ext/reuse/ToolingReuseActivator.java
@@ -1,5 +1,5 @@
 /*-------------------------------------------------------------------------+
-| Copyright 2021 fortiss GmbH                                              |
+| Copyright 2023 fortiss GmbH                                              |
 |                                                                          |
 | Licensed under the Apache License, Version 2.0 (the "License");          |
 | you may not use this file except in compliance with the License.         |
@@ -16,6 +16,8 @@
 package org.fortiss.tooling.ext.reuse;
 
 import org.eclipse.core.runtime.Plugin;
+import org.fortiss.tooling.ext.reuse.model.ReuseLibrary;
+import org.fortiss.tooling.kernel.service.IConstraintCheckerService;
 import org.osgi.framework.BundleContext;
 
 /**
@@ -36,6 +38,12 @@ public class ToolingReuseActivator extends Plugin {
 	public void start(BundleContext context) throws Exception {
 		super.start(context);
 		plugin = this;
+
+		// Objects within a ReuseLibrary do not need to comply with the constraint checks with which
+		// they should comply when they are outside of it (in a normal project). This is why the
+		// ReuseLibrary needs to be registered as an exclusion for all the usual constraint checks.
+		IConstraintCheckerService ccs = IConstraintCheckerService.getInstance();
+		ccs.registerTypeAsExcludedParentForConstraintChecks(ReuseLibrary.class);
 	}
 
 	/** {@inheritDoc} */
diff --git a/org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/internal/.ratings b/org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/internal/.ratings
index 1909826b62851eefe523cae3710501c02a39b8fa..f96feef16f57e0193a0c6c6a76223b4e1a5c5126 100644
--- a/org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/internal/.ratings
+++ b/org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/internal/.ratings
@@ -1,7 +1,7 @@
 CommandLineInterfaceService.java 6b5c94c52702f773c60b181eff52204ab379b248 GREEN
 CommandStackService.java 957bda69b5feb91f002aed4d25ed334e92801e7e GREEN
 ConnectionCompositorService.java 5a52f8a3e88c167ae6909c3d9eb3fb4706177e8b GREEN
-ConstraintCheckerService.java abd4667ceef11c47235e20a6566d8943f3417cf3 GREEN
+ConstraintCheckerService.java df7b4e8c99e8895e14ff45a96cc85ef8403a8658 GREEN
 DummyTopLevelElement.java 21807bbdafec2e0ef28f0ee9090218f90bd73aee GREEN
 ElementCompositorService.java b1924b5b349118a70149cfac5b48544897d26e9e GREEN
 LoggingService.java da784259f7b456b54bf75c41ec268f64919ce78d GREEN
diff --git a/org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/internal/ConstraintCheckerService.java b/org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/internal/ConstraintCheckerService.java
index abd4667ceef11c47235e20a6566d8943f3417cf3..df7b4e8c99e8895e14ff45a96cc85ef8403a8658 100644
--- a/org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/internal/ConstraintCheckerService.java
+++ b/org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/internal/ConstraintCheckerService.java
@@ -1,5 +1,5 @@
 /*-------------------------------------------------------------------------+
-| Copyright 2011 fortiss GmbH                                              |
+| Copyright 2023 fortiss GmbH                                              |
 |                                                                          |
 | Licensed under the Apache License, Version 2.0 (the "License");          |
 | you may not use this file except in compliance with the License.         |
@@ -17,6 +17,7 @@ package org.fortiss.tooling.kernel.internal;
 
 import static java.util.Collections.emptyList;
 import static java.util.Collections.unmodifiableMap;
+import static org.fortiss.tooling.kernel.utils.EcoreUtils.getFirstParentWithType;
 
 import java.util.ArrayList;
 import java.util.Collections;
@@ -60,6 +61,13 @@ public class ConstraintCheckerService extends EObjectAwareServiceBase<IConstrain
 	/** The constraint checker handler attribute name. */
 	private static final String HANDLER_CLASS_ATTRIBUTE_NAME = "checker";
 
+	/**
+	 * A list of all the classes whose elements are excluded from constraint checks. This exclusion
+	 * also applies to all of their children, i.e., if an element has a parent whose class is stored
+	 * in this list, it will also be excluded from all constraint checks.
+	 */
+	private static List<Class<? extends EObject>> constraintCheckExclusionTypes = new ArrayList<>();
+
 	/** {@inheritDoc} */
 	@Override
 	public void startService() {
@@ -73,6 +81,12 @@ public class ConstraintCheckerService extends EObjectAwareServiceBase<IConstrain
 		addHandler(modelElementClass, checker);
 	}
 
+	/** {@inheritDoc} */
+	@Override
+	public void registerTypeAsExcludedParentForConstraintChecks(Class<? extends EObject> clazz) {
+		constraintCheckExclusionTypes.add(clazz);
+	}
+
 	/** {@inheritDoc} */
 	@Override
 	public String getIntrospectionDescription() {
@@ -109,12 +123,23 @@ public class ConstraintCheckerService extends EObjectAwareServiceBase<IConstrain
 	}
 
 	/**
-	 * Performs all constraint checks on the given model element. Violations are
-	 * added to the given list. Constraint checks on content elements are not
-	 * considered.
+	 * Performs all constraint checks on the given model element if itself or its parents are not
+	 * excluded from such checks. Violations are added to the given list. Constraint checks on
+	 * content elements are not considered.
 	 */
 	private void performConstraintCheck(EObject modelElement,
 			List<IConstraintViolation<? extends EObject>> violationList) {
+
+		// Skip constraint checks if the given element itself is excluded from checks or if it
+		// exists within an excluded element.
+		for(Class<? extends EObject> excludedClass : constraintCheckExclusionTypes) {
+			Object foundExcludedParent = getFirstParentWithType(modelElement, excludedClass);
+			Class<?> givenClass = modelElement.getClass();
+			if(givenClass.isAssignableFrom(excludedClass) || foundExcludedParent != null) {
+				return;
+			}
+		}
+
 		List<IConstraintChecker<EObject>> handlers = getRegisteredHandlers(modelElement.getClass());
 		if(handlers == null) {
 			return;
diff --git a/org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/service/.ratings b/org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/service/.ratings
index 7b59a6c1817ab30aaab2e5b51622a26e3736a3bd..3697f4effdd95c8570df4d662566f770759e3143 100644
--- a/org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/service/.ratings
+++ b/org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/service/.ratings
@@ -1,7 +1,7 @@
 ICommandLineInterfaceService.java c3e3ba08b2a1b8125b43abd1c29b7dc0a0be2b80 GREEN
 ICommandStackService.java 678dcd1a6ab435ed0870fa2a9ec48ce47f25a187 GREEN
 IConnectionCompositorService.java 0cdf4568b2cd3e95ea195df90a84699eff36442b GREEN
-IConstraintCheckerService.java 291e53297aaea213e07e78f63350938ee2c7b155 GREEN
+IConstraintCheckerService.java dc04965ac0265f77cb846f472d76620fb05a491a GREEN
 IEclipseResourceStorageService.java b1155ca15cd9474d4d533d6cb2725e8a22040ec9 GREEN
 IElementCompositorService.java acd462ec15f3bcc247b544b46ceebee971fe1408 GREEN
 IKernelIntrospectionSystemService.java 7005c3acb4c6f978729d93279c595765e94e38eb GREEN
diff --git a/org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/service/IConstraintCheckerService.java b/org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/service/IConstraintCheckerService.java
index 291e53297aaea213e07e78f63350938ee2c7b155..dc04965ac0265f77cb846f472d76620fb05a491a 100644
--- a/org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/service/IConstraintCheckerService.java
+++ b/org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/service/IConstraintCheckerService.java
@@ -1,5 +1,5 @@
 /*-------------------------------------------------------------------------+
-| Copyright 2011 fortiss GmbH                                              |
+| Copyright 2023 fortiss GmbH                                              |
 |                                                                          |
 | Licensed under the Apache License, Version 2.0 (the "License");          |
 | you may not use this file except in compliance with the License.         |
@@ -63,4 +63,11 @@ public interface IConstraintCheckerService {
 
 	/** Registers the given checker with the service. */
 	void registerConstraintChecker(IConstraintChecker<EObject> checker, Class<?> modelElementClass);
+
+	/**
+	 * Registers the given {@link Class} as an exclusion for all constraint checks, i.e., for all
+	 * elements of this {@link Class} and for all children of such elements the existing constraint
+	 * checks will be skipped.
+	 */
+	void registerTypeAsExcludedParentForConstraintChecks(Class<? extends EObject> clazz);
 }