diff --git a/src/main/java/swiss/sib/swissprot/sapfhir/values/StepBeginPositionIRI.java b/src/main/java/swiss/sib/swissprot/sapfhir/values/StepBeginPositionIRI.java
index d152390..64931f5 100644
--- a/src/main/java/swiss/sib/swissprot/sapfhir/values/StepBeginPositionIRI.java
+++ b/src/main/java/swiss/sib/swissprot/sapfhir/values/StepBeginPositionIRI.java
@@ -51,13 +51,7 @@ public String getNamespace() {
 
     @Override
     public String getLocalName() {
-        PathGraph<P, S, ?, ?> pathGraph = graph.pathGraph();
-        S step = pathGraph.stepByRankAndPath(path, rank);
-        if (hasCachedPosition()) {
-            return Long.toString(pathGraph.beginPositionOfStep(step));
-        } else {
-            return Long.toString(position);
-        }
+        return Long.toString(getBeginPosition());
     }
 
     @Override
diff --git a/src/main/java/swiss/sib/swissprot/sapfhir/values/StepEndPositionIRI.java b/src/main/java/swiss/sib/swissprot/sapfhir/values/StepEndPositionIRI.java
index 5746b97..a416cc6 100644
--- a/src/main/java/swiss/sib/swissprot/sapfhir/values/StepEndPositionIRI.java
+++ b/src/main/java/swiss/sib/swissprot/sapfhir/values/StepEndPositionIRI.java
@@ -52,13 +52,7 @@ public String getNamespace() {
 
 	@Override
 	public String getLocalName() {
-		PathGraph<P, S, ?, ?> pathGraph = graph.pathGraph();
-		S step = pathGraph.stepByRankAndPath(path, rank);
-		if (hasCachedPosition()) {
-			return Long.toString(position);
-		} else {
-			return Long.toString(pathGraph.endPositionOfStep(step));
-		}
+		return Long.toString(getEndPosition());
 	}
 
 	@Override