--- a/backend/src/main/java/org/dive4elements/river/importer/parsers/WaterlevelDifferencesParser.java	Wed Jun 12 12:36:43 2013 +0200
+++ b/backend/src/main/java/org/dive4elements/river/importer/parsers/WaterlevelDifferencesParser.java	Thu Jun 13 07:12:35 2013 +0200
@@ -24,7 +24,9 @@
 import org.dive4elements.river.importer.ImportUnit;
 
 import org.dive4elements.river.importer.ImportWst;
+import org.dive4elements.river.importer.ImportWstQRange;
 import org.dive4elements.river.importer.ImportWstColumn;
+import org.dive4elements.river.importer.ImportWstColumnValue;
 
 
 /**
@@ -95,6 +97,17 @@
             differences.add(current);
         }
 
+        // For all differences columns, add a single Q-Range with
+        // 0.
+        for (ImportWstColumn column: columns) {
+            List<ImportWstColumnValue> cValues = column.getColumnValues();
+            column.addColumnQRange(
+                new ImportWstQRange(
+                    cValues.get(0).getPosition(),
+                    cValues.get(cValues.size() - 1).getPosition(),
+                    new BigDecimal(0d))
+                );
+        }
         current = null;
         columns = null;
     }