diff --git a/li.strolch.model/src/main/java/li/strolch/model/AbstractStrolchRootElement.java b/li.strolch.model/src/main/java/li/strolch/model/AbstractStrolchRootElement.java
index e5aadf84d..4a2cbc6ee 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/AbstractStrolchRootElement.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/AbstractStrolchRootElement.java
@@ -2,11 +2,14 @@ package li.strolch.model;
 
 import static java.util.Collections.emptyList;
 import static li.strolch.model.StrolchModelConstants.*;
+import static li.strolch.model.builder.BuilderHelper.buildParamId;
 import static li.strolch.model.builder.BuilderHelper.buildParamName;
 
+import java.util.Collections;
 import java.util.List;
 import java.util.stream.Collectors;
 
+import li.strolch.model.parameter.Parameter;
 import li.strolch.model.parameter.StringListParameter;
 import li.strolch.model.parameter.StringParameter;
 
@@ -26,27 +29,47 @@ public abstract class AbstractStrolchRootElement extends GroupedParameterizedEle
 		if (relationP == null) {
 			String name = buildParamName(param);
 			relationP = new StringParameter(param, name, "");
-
-			switch (element.getObjectType()) {
-			case Tags.RESOURCE:
-				relationP.setInterpretation(INTERPRETATION_RESOURCE_REF);
-				break;
-			case Tags.ORDER:
-				relationP.setInterpretation(INTERPRETATION_ORDER_REF);
-				break;
-			case Tags.ACTIVITY:
-				relationP.setInterpretation(INTERPRETATION_ACTIVITY_REF);
-				break;
-			}
-
-			relationP.setUom(element.getType());
-
+			setInterpretationAndUom(element, relationP);
 			relationsBag().addParameter(relationP);
 		}
 
 		relationP.setValue(element.getId());
 	}
 
+	@Override
+	public void addRelation(StrolchRootElement element) {
+		addRelation(buildParamId(element.getType()), element);
+	}
+
+	@Override
+	public void addRelation(String param, StrolchRootElement element) {
+		StringListParameter relationsP = relationsBag().getParameter(param);
+		if (relationsP == null) {
+			String name = buildParamName(param);
+			relationsP = new StringListParameter(param, name, Collections.emptyList());
+			setInterpretationAndUom(element, relationsP);
+			relationsBag().addParameter(relationsP);
+		}
+
+		relationsP.addValueIfNotContains(element.getId());
+	}
+
+	private void setInterpretationAndUom(StrolchRootElement element, Parameter<?> relationP) {
+		switch (element.getObjectType()) {
+		case Tags.RESOURCE:
+			relationP.setInterpretation(INTERPRETATION_RESOURCE_REF);
+			break;
+		case Tags.ORDER:
+			relationP.setInterpretation(INTERPRETATION_ORDER_REF);
+			break;
+		case Tags.ACTIVITY:
+			relationP.setInterpretation(INTERPRETATION_ACTIVITY_REF);
+			break;
+		}
+
+		relationP.setUom(element.getType());
+	}
+
 	@Override
 	public void setRelations(String param, List<? extends StrolchRootElement> elements) {
 
diff --git a/li.strolch.model/src/main/java/li/strolch/model/StrolchRootElement.java b/li.strolch.model/src/main/java/li/strolch/model/StrolchRootElement.java
index 82eee4140..2caa29c8e 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/StrolchRootElement.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/StrolchRootElement.java
@@ -25,6 +25,8 @@ import com.google.gson.JsonObject;
 import li.strolch.model.activity.Activity;
 import li.strolch.model.json.StrolchRootElementToJsonVisitor;
 import li.strolch.model.parameter.Parameter;
+import li.strolch.model.parameter.StringListParameter;
+import li.strolch.model.parameter.StringParameter;
 import li.strolch.model.visitor.SetParameterValueVisitor;
 import li.strolch.model.visitor.StrolchElementVisitor;
 import li.strolch.model.visitor.StrolchRootElementVisitor;
@@ -82,7 +84,16 @@ public interface StrolchRootElement extends StrolchElement, PolicyContainer, Par
 	void setVersion(Version version) throws IllegalArgumentException;
 
 	/**
-	 * Set a relation to the given element by using the given param. Should the parameter not exist, then it will be
+	 * Set a relation to the given element by using the type of the given element as the parameter ID, but lower-casing
+	 * the first letter. Should the {@link StringParameter} not exist, then it will be created
+	 *
+	 * @param element
+	 * 		the element for which to set the relation to
+	 */
+	void setRelation(StrolchRootElement element);
+
+	/**
+	 * Set a relation to the given element by using the given param. Should the {@link StringParameter} not exist, then it will be
 	 * created
 	 *
 	 * @param param
@@ -103,6 +114,26 @@ public interface StrolchRootElement extends StrolchElement, PolicyContainer, Par
 	 */
 	void setRelations(String param, List<? extends StrolchRootElement> elements);
 
+	/**
+	 * Set a relation to the given element by using the type of the given element as the parameter ID, but lower-casing
+	 * the first letter. Should the {@link StringListParameter} not exist, then it will be created
+	 *
+	 * @param element
+	 * 		the element for which to set the relation to
+	 */
+	void addRelation(StrolchRootElement element);
+
+	/**
+	 * Adds a relation to the given element by using the given parameter ID. Should the {@link StringListParameter} not exist,
+	 * then it will be created
+	 *
+	 * @param param
+	 * 		the parameter ID on which to set the relations
+	 * @param element
+	 * 		the element for which to set the relation to
+	 */
+	void addRelation(String param, StrolchRootElement element);
+
 	/**
 	 * Return a clone of this {@link StrolchElement}
 	 *