diff --git a/framework/src/main/java/de/hsadmin/module/property/mapping/DefaultListPersistentObjectMapper.java b/framework/src/main/java/de/hsadmin/module/property/mapping/DefaultListPersistentObjectMapper.java
index 60d1c08..e660c96 100644
--- a/framework/src/main/java/de/hsadmin/module/property/mapping/DefaultListPersistentObjectMapper.java
+++ b/framework/src/main/java/de/hsadmin/module/property/mapping/DefaultListPersistentObjectMapper.java
@@ -18,18 +18,13 @@ public class DefaultListPersistentObjectMapper<VO extends ValueObject> implement
 	}
 
 	@Override
-	public void writeValueToPersistentObject(Object persistentObject, String propertyName, List<VO> value) throws TechnicalException, UserException {
-		final List<VO> valueFromPersistentObject = readValueFromPersistentObject(persistentObject, propertyName);
-		valueFromPersistentObject.clear();
-//		for (final VO elem : value) {
-//			valueFromPersistentObject.add(elem);
-//			elem.
-//		}
-//		ReflectionUtil.invokeSetter(persistentObject, propertyName, ???;
+	public void writeValueToPersistentObject(final Object persistentObject, final String propertyName, final List<VO> value)
+			throws TechnicalException, UserException {
+		throw new TechnicalException("writeValueToPersistentObject not implemented");
 	}
 
 	@Override
-	public List<VO> readValueFromPersistentObject(Object persistentObject, String propertyName)  throws TechnicalException, UserException {
+	public List<VO> readValueFromPersistentObject(final Object persistentObject, final String propertyName)  throws TechnicalException, UserException {
 		final Object object = ReflectionUtil.invokeGetter(persistentObject, propertyName); 
 		if (object instanceof Collection<?>) {
 			final List<VO> valueList = new ArrayList<>();
diff --git a/services/src/main/java/de/hsadmin/service/pac/PacVO.java b/services/src/main/java/de/hsadmin/service/pac/PacVO.java
index ed270b6..f1929e7 100644
--- a/services/src/main/java/de/hsadmin/service/pac/PacVO.java
+++ b/services/src/main/java/de/hsadmin/service/pac/PacVO.java
@@ -3,10 +3,13 @@ package de.hsadmin.service.pac;
 import java.util.Date;
 import java.util.List;
 
+import de.hsadmin.bo.pac.Pac;
 import de.hsadmin.common.error.TechnicalException;
+import de.hsadmin.common.error.UserException;
 import de.hsadmin.module.ValueObject;
 import de.hsadmin.module.impl.AbstractVO;
 import de.hsadmin.module.property.ElementsType;
+import de.hsadmin.module.property.Property;
 import de.hsadmin.module.property.ReadWrite;
 import de.hsadmin.module.property.ReadWritePolicy;
 import de.hsadmin.module.property.Required;
@@ -146,4 +149,25 @@ public class PacVO extends AbstractVO implements ValueObject {
 	public void setPacComponents(List<PacComponentVO> pacComponents) {
 		this.pacComponents = pacComponents;
 	}
+	
+	@Override
+	public void copyPropertiesToPersistentObject(final Object persistentObject) throws UserException, TechnicalException 
+	{
+		assert persistentObject != null;
+		final List<Property<?>> properties = properties();
+		for (Property<?> p : properties) {
+			if ("pacComponents".equals(p.getName())) {
+				if (persistentObject instanceof Pac) {
+					final Pac persistentPac = (Pac) persistentObject;
+					for (final PacComponentVO componentVO : getPacComponents()) {
+						final String feature = componentVO.getFeature();
+						final Integer quantity = componentVO.getQuantity();
+						persistentPac.getPacComponent(feature).setQuantity(quantity);
+					}
+				}
+			} else { 
+				p.copyValueToPersistentObject(persistentObject);
+			}
+		}
+	}
 }