diff --git a/src/main/java/models/objectOrientedTransfer/DataTransferDesign.java b/src/main/java/models/objectOrientedTransfer/DataTransferDesign.java
index 90a2fd5..782548a 100644
--- a/src/main/java/models/objectOrientedTransfer/DataTransferDesign.java
+++ b/src/main/java/models/objectOrientedTransfer/DataTransferDesign.java
@@ -108,7 +108,7 @@
 				newSrcResource = relation.getDstResource();
 				newDstResource = relation.getSrcResource();
 			}
-			if (dstResource.size() < newDstResource.size()) {
+			if (dstResource.size() < newDstResource.size() || srcResource.size() < newSrcResource.size()) {
 				List<ReferenceEdge> oneDestination = new ArrayList<>();
 				List<ReferenceEdge> manyDestinations = new ArrayList<>();
 				for (int i = 0; i < newDstResource.size(); i++) {
diff --git a/src/main/java/models/objectOrientedTransfer/Relation.java b/src/main/java/models/objectOrientedTransfer/Relation.java
index a2388ed..e955b06 100644
--- a/src/main/java/models/objectOrientedTransfer/Relation.java
+++ b/src/main/java/models/objectOrientedTransfer/Relation.java
@@ -17,7 +17,23 @@
 		this.dstResource = dstResource;
 		this.multiplicity = multiplicity;
 	}
-	
+
+	public Relation(ObjectNode srcResourceNode, List<ReferenceEdge> dstResource, MultiplicityValue multiplicity) {
+		isFlat = false;
+		this.srcResource = new ArrayList<>();
+		this.dstResource = dstResource;
+		this.srcResourceNode = srcResourceNode;
+		this.multiplicity = multiplicity;
+	}
+
+	public Relation(List<ReferenceEdge> srcResource, ObjectNode dstResourceNode, MultiplicityValue multiplicity) {
+		isFlat = false;
+		this.srcResource = srcResource;
+		this.dstResource = new ArrayList<>();
+		this.dstResourceNode = dstResourceNode;
+		this.multiplicity = multiplicity;
+	}
+
 	public Relation(ObjectNode srcResourceNode, ObjectNode dstResourceNode, MultiplicityValue multiplicity) {
 		this.isFlat = true;
 		this.srcResource = new ArrayList<>();