--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/services/DynamicMainValuesTimeRangeDeterminationService.java	Tue Aug 28 14:02:23 2018 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/services/DynamicMainValuesTimeRangeDeterminationService.java	Tue Aug 28 17:05:25 2018 +0200
@@ -114,11 +114,17 @@
         // common Range and correct errorMsg
         final List<GaugeInfoResult.GaugeInfo> gaugeResultsSecondTurn = new ArrayList<>();
         for (final GaugeInfoResult.GaugeInfo gi : gaugeResults) {
-            gaugeResultsSecondTurn.add(new GaugeInfoResult.GaugeInfo(gi.errorMsg, gi.gauge, gi.startdate != null ? min : null,
-                    gi.enddate != null ? max : null));
+            gaugeResultsSecondTurn
+                    .add(new GaugeInfoResult.GaugeInfo(gi.errorMsg, gi.gauge, gi.startdate != null ? min : null, gi.enddate != null ? max : null));
         }
         if (globalErrorMsg.isEmpty() && (min.getTime() > max.getTime()))
             globalErrorMsg = getMsg(meta, "bundu.wst.gauge_timeranges_disjoint");
+
+        // add "cannot calculate UD" to globalErrorMsg
+        // Eine Berechnung der UD ist nicht möglich.
+        if (!globalErrorMsg.isEmpty())
+            globalErrorMsg = new StringBuilder().append(globalErrorMsg).append("\n").append(getMsg(meta, "bundu.wst.gauge_no_ud_calc_available")).toString();
+
         final GaugeInfoResult result = new GaugeInfoResult(gaugeResultsSecondTurn, globalErrorMsg);
 
         return result;