--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/CrossSectionFacet.java	Wed Feb 08 11:47:14 2012 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/CrossSectionFacet.java	Wed Feb 08 14:37:35 2012 +0000
@@ -20,7 +20,7 @@
  * Trival Facet for Cross Sections (profiles).
  */
 public class CrossSectionFacet
-extends      DefaultFacet
+extends      BlackboardDataFacet
 implements   FacetTypes {
 
     public static String BLACKBOARD_CS_MASTER_DATA
@@ -46,6 +46,7 @@
             keys.add(BLACKBOARD_CS_MASTER_DATA);
         }
         keys.add(artifact.identifier() + getIndex());
+        keys.addAll(super.getDataProviderKeys(art));
         return keys;
     }
 
@@ -72,8 +73,12 @@
             return getData(artifact, context);
         }
         else {
-            logger.warn("Cannot provide data for key: " + key);
-            return null;
+            Object obj = super.provideBlackboardData(artifact, key, param,
+                context);
+            if (obj == null) {
+                logger.warn("Cannot provide data for key: " + key);
+            }
+            return obj;
         }
     }