--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/access/SedimentLoadAccess.java	Mon Sep 08 19:01:26 2014 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/access/SedimentLoadAccess.java	Mon Sep 08 19:47:01 2014 +0200
@@ -27,7 +27,7 @@
 
     private int [] period;
 
-    private int sqTiId;
+    private Integer sqTiId;
 
     public SedimentLoadAccess(D4EArtifact artifact) {
         super(artifact);
@@ -115,10 +115,9 @@
     }
 
     /** Returns the selected time interval id */
-    public int getSQTiId () {
-        if (sqTiId == 0) {
-            Integer obj = getInteger("sq_ti_id");
-            sqTiId = obj == null ? 0 : obj;
+    public Integer getSQTiId () {
+        if (sqTiId == null) {
+            sqTiId = getInteger("sq_ti_id");
         }
         return sqTiId;
     }

--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/model/minfo/SedimentLoadData.java	Mon Sep 08 19:01:26 2014 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/model/minfo/SedimentLoadData.java	Mon Sep 08 19:47:01 2014 +0200
@@ -123,7 +123,7 @@
 
         private int id;
         private int kind;
-        private int sqTiId;
+        private Integer sqTiId;
 
         private String description;
 
@@ -152,14 +152,14 @@
             this.stopTime    = stopTime;
             this.sqStartTime = sqStartTime;
             this.sqStopTime  = sqStopTime;
-            this.sqTiId      = sqTiId == null ? 0 : sqTiId;
+            this.sqTiId      = sqTiId;
         }
 
         public int getId() {
             return id;
         }
 
-        public int getSQRelationTimeIntervalId() {
+        public Integer getSQRelationTimeIntervalId() {
             return sqTiId;
         }
 
@@ -437,20 +437,24 @@
     public static final Comparator<Load> LOAD_SQ_TI_CMP = new Comparator<Load>() {
         @Override
         public int compare(Load a, Load b) {
-            return a.getSQRelationTimeIntervalId() - b.getSQRelationTimeIntervalId();
-        }
-    };
-
-    public static final Comparator<Load> LOAD_ID_SQ_TI_CMP = new Comparator<Load>() {
-        @Override
-        public int compare(Load a, Load b) {
-            return LOAD_ID_CMP.compare(a, b) + LOAD_SQ_TI_CMP.compare(a,b);
+            Integer a_id = a.getSQRelationTimeIntervalId();
+            Integer b_id = b.getSQRelationTimeIntervalId();
+            if (a_id == null && b_id == null) {
+                return 0;
+            }
+            if (a_id == null) {
+                return -1;
+            }
+            if (b_id == null) {
+                return 1;
+            }
+            return a_id - b_id;
         }
     };
 
     /** Find all loads in the range a/b with the according sq_time_interval */
-    public Collection<Load> findLoads(double a, double b, int sqRelationTimeInterval) {
-        final TreeSet<Load> loads = new TreeSet<Load>(LOAD_ID_SQ_TI_CMP);
+    public Collection<Load> findLoads(double a, double b, Integer sqRelationTimeInterval) {
+        final TreeSet<Load> loads = new TreeSet<Load>(LOAD_ID_CMP);
 
         findStations(a, b, new Visitor() {
             @Override

--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/model/minfo/SedimentLoadDataCalculation.java	Mon Sep 08 19:01:26 2014 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/model/minfo/SedimentLoadDataCalculation.java	Mon Sep 08 19:47:01 2014 +0200
@@ -172,7 +172,7 @@
         double from = access.getLowerKM();
         double to   = access.getUpperKM();
 
-        int sqTiId = access.getSQTiId();
+        Integer sqTiId = access.getSQTiId();
 
         if (yearEpoch.equals("year")) {
             years = access.getPeriod();

--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/model/minfo/SedimentLoadDataValueFilter.java	Mon Sep 08 19:01:26 2014 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/model/minfo/SedimentLoadDataValueFilter.java	Mon Sep 08 19:47:01 2014 +0200
@@ -112,25 +112,25 @@
 
     public static final class SQTimeInterval implements Filter {
 
-        private int sqTiId;
+        private Integer sqTiId;
 
-        public SQTimeInterval(int sqTiId) {
+        public SQTimeInterval(Integer sqTiId) {
             this.sqTiId = sqTiId;
         }
 
         @Override
         public boolean accept(Value value) {
-            if (sqTiId == 0) {
+            if (sqTiId == null) {
                 /* Nothing set, nothing filtered */
                 return true;
             }
-            if (value.getLoad().getSQRelationTimeIntervalId() == 0) {
+            if (value.getLoad().getSQRelationTimeIntervalId() == null) {
                 /* Loads without sqRelationTimeInterval are "Schwebstoffe" and should
                  * be included. */
                 return true;
             }
             /* All other values should be filtered accordingly. */
-            return value.getLoad().getSQRelationTimeIntervalId() == sqTiId;
+            return value.getLoad().getSQRelationTimeIntervalId().equals(sqTiId);
         }
     } // class SQTimeInterval
 

--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/services/SedimentLoadInfoService.java	Mon Sep 08 19:01:26 2014 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/services/SedimentLoadInfoService.java	Mon Sep 08 19:47:01 2014 +0200
@@ -92,13 +92,13 @@
 
             for (Iterator<Load> it = loads.iterator(); it.hasNext();) {
                 /* Skip loads without time interval for this info type. */
-                if (it.next().getSQRelationTimeIntervalId() == 0) {
+                if (it.next().getSQRelationTimeIntervalId() == null) {
                     it.remove();
                 }
             }
         } else {
             if (!sq_ti_id.isEmpty()) {
-                int id = Integer.parseInt(sq_ti_id);
+                Integer id = Integer.parseInt(sq_ti_id);
                 log.debug("Finding only items for id");
                 loads = allLoadData.findLoads(fromD, toD, id);
             } else {
@@ -135,7 +135,7 @@
                     String.valueOf(calendar.get(Calendar.YEAR)));
             }
             /* SQ Time interval */
-            if (load.getSQRelationTimeIntervalId() != 0) {
+            if (load.getSQRelationTimeIntervalId() != null) {
                 ele.setAttribute("sq_ti_id", String.valueOf(load.getSQRelationTimeIntervalId()));
                 Date start = load.getSQStartTime();
                 Date stop = load.getSQStopTime();