diff --git a/src/main/java/no/nibio/vips/ipmdecisions/DataTransformer.java b/src/main/java/no/nibio/vips/ipmdecisions/DataTransformer.java
index d25a362b2a05eb6b56bf72d2a032ad1f585547a1..64dae847ae8c8c4908d2b8fd2e455740cb8cdb66 100644
--- a/src/main/java/no/nibio/vips/ipmdecisions/DataTransformer.java
+++ b/src/main/java/no/nibio/vips/ipmdecisions/DataTransformer.java
@@ -29,6 +29,7 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.stream.Collectors;
 import net.ipmdecisions.model.entity.LocationResult;
 import net.ipmdecisions.model.entity.ModelOutput;
 import net.ipmdecisions.weather.entity.LocationWeatherData;
@@ -45,10 +46,25 @@ import no.nibio.vips.observation.ObservationImpl;
  */
 public class DataTransformer {
     
-    public List<WeatherObservation> getVIPSWeatherData(WeatherData IPMWeatherData)
+    public List<WeatherObservation> getVIPSWeatherData(WeatherData IPMWeatherData) throws DataTransformerException
     {
-        List<WeatherObservation> retVal = new ArrayList<>();
         IPMDecisionsWeatherUtil ipmUtil = new IPMDecisionsWeatherUtil();
+        // Input check: Are we able to transform all the parameters?
+        List<Integer> missingParamCodes = new ArrayList<>();
+        for(Integer paramCode: IPMWeatherData.getWeatherParameters())
+        {
+            if(ipmUtil.getVIPSParameterId(paramCode) == null)
+            {
+                missingParamCodes.add(paramCode);
+            }
+        }
+        if(missingParamCodes.size() > 0)
+        {
+            String paramStr = missingParamCodes.stream().map(p->String.valueOf(p)).collect(Collectors.joining(","));
+            throw new DataTransformerException("Could not find matching internal parameter codes for: " + paramStr);
+        }
+        
+        List<WeatherObservation> retVal = new ArrayList<>();
         Integer logIntervalId = IPMWeatherData.getInterval().equals(3600) ? WeatherObservation.LOG_INTERVAL_ID_1H
                 : WeatherObservation.LOG_INTERVAL_ID_1D;
         LocationWeatherData oneLocation = IPMWeatherData.getLocationWeatherData().get(0);
diff --git a/src/main/java/no/nibio/vips/ipmdecisions/DataTransformerException.java b/src/main/java/no/nibio/vips/ipmdecisions/DataTransformerException.java
new file mode 100644
index 0000000000000000000000000000000000000000..fe36dbdfc8652775339b8b985fa0687b172960a6
--- /dev/null
+++ b/src/main/java/no/nibio/vips/ipmdecisions/DataTransformerException.java
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2021 NIBIO <http://www.nibio.no/>. 
+ * 
+ * This file is part of VIPSCommon.
+ * VIPSCommon is free software: you can redistribute it and/or modify
+ * it under the terms of the NIBIO Open Source License as published by 
+ * NIBIO, either version 1 of the License, or (at your option) any
+ * later version.
+ * 
+ * VIPSCommon is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * NIBIO Open Source License for more details.
+ * 
+ * You should have received a copy of the NIBIO Open Source License
+ * along with VIPSCommon.  If not, see <http://www.nibio.no/licenses/>.
+ * 
+ */
+
+package no.nibio.vips.ipmdecisions;
+
+/**
+ * @copyright 2021 <a href="http://www.nibio.no/">NIBIO</a>
+ * @author Tor-Einar Skog <tor-einar.skog@nibio.no>
+ */
+class DataTransformerException extends Exception {
+    public DataTransformerException(String msg)
+    {
+        super(msg);
+    }
+}
diff --git a/src/main/java/no/nibio/vips/ipmdecisions/IPMDecisionsWeatherUtil.java b/src/main/java/no/nibio/vips/ipmdecisions/IPMDecisionsWeatherUtil.java
index ab91109bd9c2bf2e12b0167830420145bc025f17..34cddb6551cc527a065fbdbec102c6a691dae32f 100644
--- a/src/main/java/no/nibio/vips/ipmdecisions/IPMDecisionsWeatherUtil.java
+++ b/src/main/java/no/nibio/vips/ipmdecisions/IPMDecisionsWeatherUtil.java
@@ -44,7 +44,8 @@ public class IPMDecisionsWeatherUtil {
             4002, WeatherElements.WIND_SPEED_2M, // FM2/FF2
             4003, WeatherElements.WIND_SPEED_2M, // FM2/FF2
             5001, WeatherElements.GLOBAL_RADIATION, // Q0
-            3101, WeatherElements.LEAF_WETNESS_DURATION // BT
+            3101, WeatherElements.LEAF_WETNESS_DURATION, // BT
+            1901, WeatherElements.DEW_POINT_TEMPERATURE // DT 
     );
     
     public Integer getIPMParameterId(String VIPSParameterId)