diff --git a/src/OSMGeoProcessing/OSMToolHelper.cs b/src/OSMGeoProcessing/OSMToolHelper.cs
index 8729f8a..93000a8 100644
--- a/src/OSMGeoProcessing/OSMToolHelper.cs
+++ b/src/OSMGeoProcessing/OSMToolHelper.cs
@@ -4322,6 +4322,7 @@ internal bool IsThisWayALine(string osmID, IFeatureClass lineFeatureClass, strin
             try
             {
                 int osmIDPolygonFieldIndex = polygonFeatureClass.FindField("OSMID");
+                int osmSupportingElementFieldIndex = polygonFeatureClass.FindField("osmSupportingElement");
                 string sqlPolyOSMID = polygonFeatureClass.SqlIdentifier("OSMID");
 
                 foreach (var relationItem in currentRelation.Items)
@@ -4336,7 +4337,7 @@ internal bool IsThisWayALine(string osmID, IFeatureClass lineFeatureClass, strin
                             {
                                 osmIDQueryFilter.WhereClause = polygonFeatureClass.WhereClauseByExtensionVersion(currentRelationMember.@ref, "OSMID", 2);
 
-                                IFeatureCursor featureCursor = polygonFeatureClass.Search(osmIDQueryFilter, false);
+                                IFeatureCursor featureCursor = polygonFeatureClass.Update(osmIDQueryFilter, false);
                                 comReleaser.ManageLifetime(featureCursor);
 
                                 IFeature foundPolygonFeature = featureCursor.NextFeature();
@@ -4346,6 +4347,12 @@ internal bool IsThisWayALine(string osmID, IFeatureClass lineFeatureClass, strin
 
                                 tag[] foundTags = _osmUtility.retrieveOSMTags(foundPolygonFeature, osmIDPolygonFieldIndex, ((IDataset)polygonFeatureClass).Workspace);
 
+                                // set this feature from which we transfer to become a supporting element
+                                if (osmSupportingElementFieldIndex > -1)
+                                    foundPolygonFeature.set_Value(osmSupportingElementFieldIndex, "yes");
+
+                                featureCursor.UpdateFeature(foundPolygonFeature);
+
                                 foreach (tag currentWayTag in foundTags)
                                 {
                                     // first one in wins