--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/states/RangeState.java	Mon May 28 16:39:56 2018 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/states/RangeState.java	Mon May 28 18:18:21 2018 +0200
@@ -8,45 +8,33 @@
 
 package org.dive4elements.river.artifacts.states;
 
+import org.apache.log4j.Logger;
 import org.dive4elements.artifacts.Artifact;
-
 import org.dive4elements.river.artifacts.D4EArtifact;
-
 import org.dive4elements.river.artifacts.access.RangeAccess;
 
-import org.apache.log4j.Logger;
-
-
 /**
  * State in which km range is set.
+ * 
  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
  */
 public abstract class RangeState extends DefaultState {
 
     /** The log that is used in this class. */
-    private Logger log = Logger.getLogger(RangeState.class);
-
+    private final Logger log = Logger.getLogger(RangeState.class);
 
     public RangeState() {
     }
 
     protected abstract double[] getMinMax(Artifact artifact);
 
-
-    protected boolean validateBounds(
-        double fromValid, double toValid,
-        double from,      double to)
-    throws IllegalArgumentException
-    {
-        if (from < fromValid) {
-            log.error(
-                "Invalid 'from'. " + from + " is smaller than " + fromValid);
+    protected boolean validateBounds(final double fromValid, final double toValid, final double from, final double to) throws IllegalArgumentException {
+        if (from < fromValid || from > toValid) {
+            this.log.error("Invalid 'from'. " + from + " is smaller than " + fromValid);
             // error message used in client to resolve i18n
             throw new IllegalArgumentException("error_feed_from_out_of_range");
-        }
-        else if (to > toValid) {
-            log.error(
-                "Invalid 'to'. " + to + " is bigger than " + toValid);
+        } else if (to > toValid || to < fromValid) {
+            this.log.error("Invalid 'to'. " + to + " is bigger than " + toValid);
             // error message used in client to resolve i18n
             throw new IllegalArgumentException("error_feed_to_out_of_range");
         }
@@ -54,50 +42,48 @@
         return true;
     }
 
-
     /**
      * Validates a given range with a given valid range.
      *
-     * @param fromValid Valid lower value of the range.
-     * @param toValid Valid upper value of the range.
-     * @param from The lower value.
-     * @param to The upper value.
-     * @param step The step width.
+     * @param fromValid
+     *            Valid lower value of the range.
+     * @param toValid
+     *            Valid upper value of the range.
+     * @param from
+     *            The lower value.
+     * @param to
+     *            The upper value.
+     * @param step
+     *            The step width.
      *
      * @return true, if everything was fine, otherwise an exception is thrown.
      */
-    protected boolean validateBounds(
-        double fromValid, double toValid,
-        double from,      double to,      double step)
-    throws IllegalArgumentException
-    {
-        log.debug("RangeState.validateRange");
+    protected boolean validateBounds(final double fromValid, final double toValid, final double from, final double to, final double step)
+            throws IllegalArgumentException {
+        this.log.debug("RangeState.validateRange");
 
         // XXX The step width is not validated at the moment!
         return validateBounds(fromValid, toValid, from, to);
     }
 
-
     @Override
-    public boolean validate(Artifact artifact)
-    throws IllegalArgumentException
-    {
-        D4EArtifact flys = (D4EArtifact) artifact;
+    public boolean validate(final Artifact artifact) throws IllegalArgumentException {
+        final D4EArtifact flys = (D4EArtifact) artifact;
 
         try {
-            RangeAccess rangeAccess = new RangeAccess(flys);
-            double from = rangeAccess.getFrom();
-            double to   = rangeAccess.getTo();
-            double step = rangeAccess.getStep();
+            final RangeAccess rangeAccess = new RangeAccess(flys);
+            final double from = rangeAccess.getFrom();
+            final double to = rangeAccess.getTo();
+            final double step = rangeAccess.getStep();
 
-            double[] minmax = getMinMax(flys);
+            final double[] minmax = getMinMax(flys);
 
             return validateBounds(minmax[0], minmax[1], from, to, step);
         }
-        catch (NumberFormatException nfe) {
+        catch (final NumberFormatException nfe) {
             throw new IllegalArgumentException("error_invalid_double_value");
         }
-        catch (NullPointerException npe) {
+        catch (final NullPointerException npe) {
             throw new IllegalArgumentException("error_empty_state");
         }
     }

--- a/gwt-client/src/main/java/org/dive4elements/river/client/client/FLYSConstants.properties	Mon May 28 16:39:56 2018 +0200
+++ b/gwt-client/src/main/java/org/dive4elements/river/client/client/FLYSConstants.properties	Mon May 28 18:18:21 2018 +0200
@@ -358,8 +358,8 @@
 error_no_sedimentloadinfo_data = No Sedimentload data for the current parameters.
 
 error_feed_no_data = No input data found.
-error_feed_from_out_of_range = The lower value is bigger than the upper value.
-error_feed_to_out_of_range = The upper value is out or the valid range.
+error_feed_from_out_of_range = The start value is out of the valid range.
+error_feed_to_out_of_range = The end value is out of the valid range.
 error_feed_from_bigger_to = The lower value is bigger than the upper value.
 error_feed_invalid_wq_mode = Invalid WQ-Mode selected.
 error_feed_number_format_float = The inserted value is no floating point number.

--- a/gwt-client/src/main/java/org/dive4elements/river/client/client/FLYSConstants_de.properties	Mon May 28 16:39:56 2018 +0200
+++ b/gwt-client/src/main/java/org/dive4elements/river/client/client/FLYSConstants_de.properties	Mon May 28 18:18:21 2018 +0200
@@ -358,8 +358,8 @@
 error_no_sedimentloadinfo_data = F\u00fcr die gew\u00e4te Parametrisierung liegen keine Daten vor.
 
 error_feed_no_data = Keine Eingabedaten gefunden.
-error_feed_from_out_of_range = Der untere Wert liegt au\u00dferhalb des g\u00fcltigen Wertebereiches.
-error_feed_to_out_of_range = Der obere Wert liegt au\u00dferhalb des g\u00fcltigen Wertebereiches.
+error_feed_from_out_of_range = Der Start-Wert liegt au\u00dferhalb des g\u00fcltigen Wertebereiches.
+error_feed_to_out_of_range = Der End-Wert liegt au\u00dferhalb des g\u00fcltigen Wertebereiches.
 error_feed_from_bigger_to = Der untere Wert ist gr\u00f6\u00dfer als der obere Wert.
 error_feed_invalid_wq_mode = Ung\u00fcltiger Modus f\u00fcr die WQ-Eingabe gew\u00e4hlt.
 error_feed_number_format_float = Der eingegebene Wert ist keine Flie\u00dfkommazahl.