Index: trunk/src/org/openstreetmap/josm/data/validation/OsmValidator.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/validation/OsmValidator.java	(revision 5271)
+++ trunk/src/org/openstreetmap/josm/data/validation/OsmValidator.java	(revision 5272)
@@ -36,4 +36,5 @@
 import org.openstreetmap.josm.data.validation.tests.MultipolygonTest;
 import org.openstreetmap.josm.data.validation.tests.NameMismatch;
+import org.openstreetmap.josm.data.validation.tests.NodesDuplicatingWayTags;
 import org.openstreetmap.josm.data.validation.tests.NodesWithSameName;
 import org.openstreetmap.josm.data.validation.tests.OverlappingAreas;
@@ -104,4 +105,5 @@
         OverlappingAreas.class, // ID 2201 .. 2299
         WayConnectedToArea.class, // ID 2301 .. 2399
+        NodesDuplicatingWayTags.class, // ID 2401 .. 2499
     };
 
Index: trunk/src/org/openstreetmap/josm/data/validation/tests/NodesDuplicatingWayTags.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/validation/tests/NodesDuplicatingWayTags.java	(revision 5272)
+++ trunk/src/org/openstreetmap/josm/data/validation/tests/NodesDuplicatingWayTags.java	(revision 5272)
@@ -0,0 +1,58 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.data.validation.tests;
+
+import static org.openstreetmap.josm.tools.I18n.tr;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.openstreetmap.josm.data.osm.Node;
+import org.openstreetmap.josm.data.osm.OsmPrimitive;
+import org.openstreetmap.josm.data.osm.Way;
+import org.openstreetmap.josm.data.validation.Severity;
+import org.openstreetmap.josm.data.validation.Test;
+import org.openstreetmap.josm.data.validation.TestError;
+
+/**
+ * Warn when a node has the same tags as its parent way. The check is rather
+ * conservative: it warns only when the tags are identical and important (i.e.,
+ * no warning for a way and a node that only have a "source=PGS" tag).
+ * <p>
+ * See JOSM ticket #7639 for the original request.
+ * 
+ * @author Mrwojo
+ */
+public class NodesDuplicatingWayTags extends Test {
+
+    protected static final int NODE_DUPING_PARENT_WAY_TAGS = 2401;
+
+    public NodesDuplicatingWayTags() {
+        super(tr("Nodes duplicating way tags"),
+                tr("Checks for nodes that have the same tags as their parent way."));
+    }
+
+    @Override
+    public void visit(Way way) {
+        // isTagged represents interesting tags (not "source", "created_by", ...)
+        if (!way.isUsable() || !way.isTagged())
+            return;
+
+        // Use a set so you don't report the same node of an area/loop more than once.
+        Set<OsmPrimitive> dupedWayTags = new HashSet<OsmPrimitive>();
+
+        // Check for nodes in the way that have tags identical to the way's tags.
+        for (Node node : way.getNodes()) {
+            if (way.hasSameTags(node)) {
+                dupedWayTags.add(node);
+            }
+        }
+
+        if (!dupedWayTags.isEmpty()) {
+            // Add the way for the warning.
+            dupedWayTags.add(way);
+
+            errors.add(new TestError(this, Severity.WARNING, tr("Nodes duplicating parent way tags"),
+                    NODE_DUPING_PARENT_WAY_TAGS, dupedWayTags));
+        }
+    }
+}