diff --git a/hibernate/mappings/src/main/resources/mapping/old/observation/Observation.hbm.xml b/hibernate/mappings/src/main/resources/mapping/old/observation/Observation.hbm.xml
index 2ac24cdc64..86d7932b86 100644
--- a/hibernate/mappings/src/main/resources/mapping/old/observation/Observation.hbm.xml
+++ b/hibernate/mappings/src/main/resources/mapping/old/observation/Observation.hbm.xml
@@ -48,7 +48,7 @@
         <many-to-one name="unit" class="org.n52.sos.ds.hibernate.entities.Unit" fetch="select" lazy="no-proxy" foreign-key="observationUnitFk">
             <column name="unitId" not-null="false" />
         </many-to-one>
-        <set name="offerings" table="observationHasOffering" inverse="false" fetch="select" lazy="false" >
+        <set name="offerings" table="observationHasOffering" inverse="false" fetch="select" lazy="true" >
             <key>
                 <column name="observationId" not-null="true" index="obshasoffobservationidx" />
             </key>
diff --git a/hibernate/mappings/src/main/resources/mapping/old/observation/ObservationInfo.hbm.xml b/hibernate/mappings/src/main/resources/mapping/old/observation/ObservationInfo.hbm.xml
index d27728025b..b9a2f54a84 100644
--- a/hibernate/mappings/src/main/resources/mapping/old/observation/ObservationInfo.hbm.xml
+++ b/hibernate/mappings/src/main/resources/mapping/old/observation/ObservationInfo.hbm.xml
@@ -53,7 +53,7 @@
         <many-to-one name="unit" class="org.n52.sos.ds.hibernate.entities.Unit" fetch="select" lazy="no-proxy" foreign-key="observationUnitFk">
             <column name="unitId" not-null="false" />
         </many-to-one>
-        <set name="offerings" table="observationHasOffering" inverse="false" fetch="select" lazy="false">
+        <set name="offerings" table="observationHasOffering" inverse="false" fetch="select" lazy="true">
             <key>
                 <column name="observationId" not-null="true" />
             </key>
diff --git a/hibernate/mappings/src/main/resources/mapping/series/observation/SeriesObservation.hbm.xml b/hibernate/mappings/src/main/resources/mapping/series/observation/SeriesObservation.hbm.xml
index a11c2fe79a..ed16828493 100644
--- a/hibernate/mappings/src/main/resources/mapping/series/observation/SeriesObservation.hbm.xml
+++ b/hibernate/mappings/src/main/resources/mapping/series/observation/SeriesObservation.hbm.xml
@@ -42,7 +42,7 @@
         <many-to-one name="unit" class="org.n52.sos.ds.hibernate.entities.Unit" fetch="select" lazy="no-proxy" foreign-key="observationUnitFk">
             <column name="unitId" not-null="false" />
         </many-to-one>
-        <set name="offerings" table="observationHasOffering" inverse="false" fetch="select" lazy="false" >
+        <set name="offerings" table="observationHasOffering" inverse="false" fetch="select" lazy="true" >
             <key>
                 <column name="observationId" not-null="true" index="obshasoffobservationidx" />
             </key>
diff --git a/hibernate/mappings/src/main/resources/mapping/series/observation/SeriesObservationInfo.hbm.xml b/hibernate/mappings/src/main/resources/mapping/series/observation/SeriesObservationInfo.hbm.xml
index 9a855d054d..e344f46f5e 100644
--- a/hibernate/mappings/src/main/resources/mapping/series/observation/SeriesObservationInfo.hbm.xml
+++ b/hibernate/mappings/src/main/resources/mapping/series/observation/SeriesObservationInfo.hbm.xml
@@ -42,7 +42,7 @@
         <many-to-one name="unit" class="org.n52.sos.ds.hibernate.entities.Unit" fetch="select" lazy="no-proxy" foreign-key="observationUnitFk">
             <column name="unitId" not-null="false" />
         </many-to-one>
-        <set name="offerings" table="observationHasOffering" inverse="false" fetch="select" lazy="false" >
+        <set name="offerings" table="observationHasOffering" inverse="false" fetch="select" lazy="true" >
             <key>
                 <column name="observationId" not-null="true" index="obshasoffobservationidx" />
             </key>
diff --git a/hibernate/mappings/src/main/resources/mapping/series/observation/SeriesObservationTime.hbm.xml b/hibernate/mappings/src/main/resources/mapping/series/observation/SeriesObservationTime.hbm.xml
index b5b4e0f4b6..05bfc7fe1f 100644
--- a/hibernate/mappings/src/main/resources/mapping/series/observation/SeriesObservationTime.hbm.xml
+++ b/hibernate/mappings/src/main/resources/mapping/series/observation/SeriesObservationTime.hbm.xml
@@ -27,7 +27,7 @@
         <property name="validTimeEnd" type="timestamp">
             <column name="validTimeEnd" length="29" />
         </property>
-                <set name="offerings" table="observationHasOffering" inverse="false" fetch="select" lazy="false" >
+                <set name="offerings" table="observationHasOffering" inverse="false" fetch="select" lazy="true" >
             <key>
                 <column name="observationId" not-null="true" index="obshasoffobservationidx" />
             </key>