diff --git a/docker-compose.yml b/docker-compose.yml
index e8cd9dddde..32dc9f21d7 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -3,7 +3,7 @@ version: '3.7'
 services:
 
   app:
-    image: daschswiss/dsp-app:v10.23.5
+    image: daschswiss/dsp-app:v10.24.2
     ports:
       - "4200:4200"
     networks:
diff --git a/integration/src/test/scala/org/knora/webapi/e2e/v2/SearchRouteV2R2RSpec.scala b/integration/src/test/scala/org/knora/webapi/e2e/v2/SearchRouteV2R2RSpec.scala
index 2aaf3ef4bf..740d44ca2e 100644
--- a/integration/src/test/scala/org/knora/webapi/e2e/v2/SearchRouteV2R2RSpec.scala
+++ b/integration/src/test/scala/org/knora/webapi/e2e/v2/SearchRouteV2R2RSpec.scala
@@ -216,6 +216,50 @@ class SearchRouteV2R2RSpec extends R2RSpec {
     /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
     // Queries without type inference
 
+    "perform a Gravsearch query using simple schema which allows to sort the results by external link" in {
+      val query =
+        """PREFIX knora-api: <http://api.knora.org/ontology/knora-api/simple/v2#>
+          |PREFIX anything: <http://0.0.0.0:3333/ontology/0001/anything/simple/v2#>
+          |
+          |CONSTRUCT {
+          |  ?res knora-api:isMainResource true .
+          |  ?res anything:hasUri ?exLink .
+          |} WHERE {
+          |  ?res a knora-api:Resource .
+          |  ?res a anything:Thing .
+          |  ?res anything:hasUri ?exLink .
+          |}
+          |ORDER BY (?exLink)
+          |""".stripMargin
+
+      Post(
+        "/v2/searchextended",
+        HttpEntity(SparqlQueryConstants.`application/sparql-query`, query)
+      ) ~> searchPath ~> check(assert(status == StatusCodes.OK))
+    }
+
+    "perform a Gravsearch query using complex schema which allows to sort the results by external link" in {
+      val query =
+        """PREFIX knora-api: <http://api.knora.org/ontology/knora-api/v2#>
+          |PREFIX anything: <http://0.0.0.0:3333/ontology/0001/anything/v2#>
+          |
+          |CONSTRUCT {
+          |  ?res knora-api:isMainResource true .
+          |  ?res anything:hasUri ?exLink .
+          |} WHERE {
+          |  ?res a knora-api:Resource .
+          |  ?res a anything:Thing .
+          |  ?res anything:hasUri ?exLink .
+          |}
+          |ORDER BY (?exLink)
+          |""".stripMargin
+
+      Post(
+        "/v2/searchextended",
+        HttpEntity(SparqlQueryConstants.`application/sparql-query`, query)
+      ) ~> searchPath ~> check(assert(status == StatusCodes.OK))
+    }
+
     "perform a Gravsearch query for an anything:Thing with an optional date and sort by date" in {
 
       val gravsearchQuery =
diff --git a/webapi/src/main/scala/org/knora/webapi/messages/util/search/gravsearch/prequery/AbstractPrequeryGenerator.scala b/webapi/src/main/scala/org/knora/webapi/messages/util/search/gravsearch/prequery/AbstractPrequeryGenerator.scala
index cf29ed3902..a450a06d9a 100644
--- a/webapi/src/main/scala/org/knora/webapi/messages/util/search/gravsearch/prequery/AbstractPrequeryGenerator.scala
+++ b/webapi/src/main/scala/org/knora/webapi/messages/util/search/gravsearch/prequery/AbstractPrequeryGenerator.scala
@@ -795,21 +795,23 @@ abstract class AbstractPrequeryGenerator(
   // that point to literals. This is used only for generating additional statements for ORDER BY clauses, so it only needs to include
   // types that have a meaningful order.
   private val valueTypesToValuePredsForOrderBy: Map[IRI, IRI] = Map(
-    OntologyConstants.Xsd.Integer                    -> OntologyConstants.KnoraBase.ValueHasInteger,
-    OntologyConstants.Xsd.Decimal                    -> OntologyConstants.KnoraBase.ValueHasDecimal,
-    OntologyConstants.Xsd.Boolean                    -> OntologyConstants.KnoraBase.ValueHasBoolean,
-    OntologyConstants.Xsd.String                     -> OntologyConstants.KnoraBase.ValueHasString,
-    OntologyConstants.KnoraApiV2Simple.Date          -> OntologyConstants.KnoraBase.ValueHasStartJDN,
-    OntologyConstants.KnoraApiV2Simple.Color         -> OntologyConstants.KnoraBase.ValueHasColor,
-    OntologyConstants.KnoraApiV2Simple.Geoname       -> OntologyConstants.KnoraBase.ValueHasGeonameCode,
-    OntologyConstants.KnoraApiV2Complex.TextValue    -> OntologyConstants.KnoraBase.ValueHasString,
-    OntologyConstants.KnoraApiV2Complex.IntValue     -> OntologyConstants.KnoraBase.ValueHasInteger,
-    OntologyConstants.KnoraApiV2Complex.DecimalValue -> OntologyConstants.KnoraBase.ValueHasDecimal,
-    OntologyConstants.KnoraApiV2Complex.TimeValue    -> OntologyConstants.KnoraBase.ValueHasTimeStamp,
     OntologyConstants.KnoraApiV2Complex.BooleanValue -> OntologyConstants.KnoraBase.ValueHasBoolean,
-    OntologyConstants.KnoraApiV2Complex.DateValue    -> OntologyConstants.KnoraBase.ValueHasStartJDN,
     OntologyConstants.KnoraApiV2Complex.ColorValue   -> OntologyConstants.KnoraBase.ValueHasColor,
-    OntologyConstants.KnoraApiV2Complex.GeonameValue -> OntologyConstants.KnoraBase.ValueHasGeonameCode
+    OntologyConstants.KnoraApiV2Complex.DateValue    -> OntologyConstants.KnoraBase.ValueHasStartJDN,
+    OntologyConstants.KnoraApiV2Complex.DecimalValue -> OntologyConstants.KnoraBase.ValueHasDecimal,
+    OntologyConstants.KnoraApiV2Complex.GeonameValue -> OntologyConstants.KnoraBase.ValueHasGeonameCode,
+    OntologyConstants.KnoraApiV2Complex.IntValue     -> OntologyConstants.KnoraBase.ValueHasInteger,
+    OntologyConstants.KnoraApiV2Complex.TextValue    -> OntologyConstants.KnoraBase.ValueHasString,
+    OntologyConstants.KnoraApiV2Complex.TimeValue    -> OntologyConstants.KnoraBase.ValueHasTimeStamp,
+    OntologyConstants.KnoraApiV2Complex.UriValue     -> OntologyConstants.KnoraBase.ValueHasUri,
+    OntologyConstants.KnoraApiV2Simple.Color         -> OntologyConstants.KnoraBase.ValueHasColor,
+    OntologyConstants.KnoraApiV2Simple.Date          -> OntologyConstants.KnoraBase.ValueHasStartJDN,
+    OntologyConstants.KnoraApiV2Simple.Geoname       -> OntologyConstants.KnoraBase.ValueHasGeonameCode,
+    OntologyConstants.Xsd.Boolean                    -> OntologyConstants.KnoraBase.ValueHasBoolean,
+    OntologyConstants.Xsd.Decimal                    -> OntologyConstants.KnoraBase.ValueHasDecimal,
+    OntologyConstants.Xsd.Integer                    -> OntologyConstants.KnoraBase.ValueHasInteger,
+    OntologyConstants.Xsd.String                     -> OntologyConstants.KnoraBase.ValueHasString,
+    OntologyConstants.Xsd.Uri                        -> OntologyConstants.KnoraBase.ValueHasUri
   )
 
   /**