diff --git a/src/main/java/semantic/controler/DoItYourselfControl.java b/src/main/java/semantic/controler/DoItYourselfControl.java
index 0dfeccd..2b8243e 100644
--- a/src/main/java/semantic/controler/DoItYourselfControl.java
+++ b/src/main/java/semantic/controler/DoItYourselfControl.java
@@ -18,9 +18,14 @@ public class DoItYourselfControl implements IControlFunctions {
 	@Override
 	public void instantiateObservations(List<ObservationEntity> obsList,
 																			String paramURI) {
-		obsList.forEach(observationEntity -> customModel.createObs(
-				observationEntity.getValue().toString(),
-				paramURI,
-				customModel.createInstant(observationEntity.getTimestamp())));
+		obsList.forEach(observationEntity -> {
+			String instant = customModel.createInstant(observationEntity.getTimestamp());
+//			System.out.println("Adding new observation: " + observationEntity.getValue().toString() + " " + paramURI + " " + instant);
+			customModel.createObs(
+					observationEntity.getValue().toString(),
+					paramURI,
+					instant
+					);
+		});
 	}
 }
diff --git a/src/main/java/semantic/model/DoItYourselfModel.java b/src/main/java/semantic/model/DoItYourselfModel.java
index 23558dd..5036837 100644
--- a/src/main/java/semantic/model/DoItYourselfModel.java
+++ b/src/main/java/semantic/model/DoItYourselfModel.java
@@ -53,10 +53,14 @@ public class DoItYourselfModel implements IModelFunctions {
 		String obsInstanceURI = model.createInstance(instantURI + "_" + paramURI + "_" + value, obsClassURI);
 		String dataValueURI = model.getEntityURI("a pour valeur").get(0);
 		String datePropertyURI = model.getEntityURI("a pour date").get(0);
+		String measurePropertyURI = model.getEntityURI("mesure").get(0);
 		String sensorURI = model.whichSensorDidIt(getInstantTimestamp(instantURI), paramURI);
+		model.addObjectPropertyToIndividual(obsInstanceURI, measurePropertyURI, paramURI);
 		model.addDataPropertyToIndividual(obsInstanceURI, dataValueURI, value);
 		model.addObjectPropertyToIndividual(obsInstanceURI, datePropertyURI, instantURI);
-		model.addObservationToSensor(obsInstanceURI, sensorURI);
+		if (sensorURI != null) {
+			model.addObservationToSensor(obsInstanceURI, sensorURI);
+		}
 		return obsInstanceURI;
 	}
 }
diff --git a/src/test/java/semantic/TestModelFunctions.java b/src/test/java/semantic/TestModelFunctions.java
index 7ad001f..f0fef43 100644
--- a/src/test/java/semantic/TestModelFunctions.java
+++ b/src/test/java/semantic/TestModelFunctions.java
@@ -57,10 +57,12 @@ public class TestModelFunctions {
 		String obsClassURI = c.getModel().getEntityURI("Observation").get(0);
 		String hasDataValueURI = c.getModel().getEntityURI("a pour valeur").get(0);
 		String datePropertyURI = c.getModel().getEntityURI("a pour date").get(0);
+		String measurePropertyURI = c.getModel().getEntityURI("mesure").get(0);
 		String sensorURI = c.getModel().whichSensorDidIt("2014-02-13T06:20:00", paramURI);
 		Assert.assertTrue("L'observation n'est pas une instance de la bonne classe", c.getModel().isOfType(obsURI, obsClassURI));
 		Assert.assertTrue("L'observation n'a pas la bonne valeur", c.getModel().hasDataPropertyValue(obsURI, hasDataValueURI, value));
 		Assert.assertTrue("L'observation n'a pas la bonne date", c.getModel().hasObjectProperty(obsURI, datePropertyURI, instantURI));
+		Assert.assertTrue("L'observation n'est pas rattachée au bon paramètre", c.getModel().hasObjectProperty(obsURI, measurePropertyURI, paramURI));
 		Assert.assertTrue("L'observation n'est pas rattachée au bon capteur", c.getModel().hasSensorDoneIt(obsURI, sensorURI));
 	}
 }