Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.IO/SoilProfiles/MacroStabilityInwardsStochasticSoilModelTransformer.cs
===================================================================
diff -u -r57bc6a475f6cdd57b1a0ebf70cdf533014afd1ff -rc5c91f8ca724aef52a6cd9055a2a32bcd6bc0c03
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.IO/SoilProfiles/MacroStabilityInwardsStochasticSoilModelTransformer.cs	(.../MacroStabilityInwardsStochasticSoilModelTransformer.cs)	(revision 57bc6a475f6cdd57b1a0ebf70cdf533014afd1ff)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.IO/SoilProfiles/MacroStabilityInwardsStochasticSoilModelTransformer.cs	(.../MacroStabilityInwardsStochasticSoilModelTransformer.cs)	(revision c5c91f8ca724aef52a6cd9055a2a32bcd6bc0c03)
@@ -22,6 +22,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using log4net;
 using Ringtoets.Common.IO.Exceptions;
 using Ringtoets.Common.IO.SoilProfile;
 using Ringtoets.Common.IO.SoilProfile.Schema;
@@ -36,6 +37,7 @@
     public class MacroStabilityInwardsStochasticSoilModelTransformer : IStochasticSoilModelTransformer<MacroStabilityInwardsStochasticSoilModel>
     {
         private readonly Dictionary<ISoilProfile, IMacroStabilityInwardsSoilProfile> soilProfiles = new Dictionary<ISoilProfile, IMacroStabilityInwardsSoilProfile>();
+        private static readonly ILog log = LogManager.GetLogger(typeof(MacroStabilityInwardsStochasticSoilModelTransformer));
 
         public MacroStabilityInwardsStochasticSoilModel Transform(StochasticSoilModel stochasticSoilModel)
         {
@@ -79,14 +81,12 @@
             IEnumerable<StochasticSoilProfile> stochasticSoilProfiles,
             string soilModelName)
         {
-            IEnumerable<StochasticSoilProfile> profilesToTransform =
-                StochasticSoilProfileHelper.GetValidatedStochasticSoilProfilesToTransform(stochasticSoilProfiles,
-                                                                                          soilModelName);
-
-            return profilesToTransform.Select(
+            MacroStabilityInwardsStochasticSoilProfile[] transformedProfiles = stochasticSoilProfiles.Select(
                 ssp => MacroStabilityInwardsStochasticSoilProfileTransformer.Transform(
                     ssp,
                     GetTransformedSoilProfile(ssp.SoilProfile))).ToArray();
+
+            return GetUniqueStochasticSoilProfiles(transformedProfiles, soilModelName);
         }
 
         /// <summary>
@@ -110,5 +110,47 @@
             }
             return macroStabilityInwardsSoilProfile;
         }
+
+        /// <summary>
+        /// Filters a collection of <see cref="MacroStabilityInwardsStochasticSoilProfile"/> to determine which items
+        /// are unique.
+        /// </summary>
+        /// <param name="stochasticSoilProfiles">The collection of <see cref="MacroStabilityInwardsStochasticSoilProfile"/>
+        /// to filter.</param>
+        /// <param name="soilModelName">The name of the soil model.</param>
+        /// <returns>A collection of unique <see cref="MacroStabilityInwardsStochasticSoilProfile"/>.</returns>
+        /// <exception cref="ImportedDataTransformException">Thrown when a <see cref="StochasticSoilProfile"/>
+        /// is invalid.</exception>
+        private static IEnumerable<MacroStabilityInwardsStochasticSoilProfile> GetUniqueStochasticSoilProfiles(
+            IEnumerable<MacroStabilityInwardsStochasticSoilProfile> stochasticSoilProfiles,
+            string soilModelName)
+        {
+            List<MacroStabilityInwardsStochasticSoilProfile> uniqueStochasticSoilProfiles = stochasticSoilProfiles.ToList();
+            MacroStabilityInwardsStochasticSoilProfile[] allStochasticSoilProfiles = uniqueStochasticSoilProfiles.ToArray();
+
+            try
+            {
+                for (var i = 1; i < allStochasticSoilProfiles.Length; i++)
+                {
+                    MacroStabilityInwardsStochasticSoilProfile previousProfile = allStochasticSoilProfiles[i - 1];
+                    MacroStabilityInwardsStochasticSoilProfile currentProfile = allStochasticSoilProfiles[i];
+                    if (ReferenceEquals(currentProfile.SoilProfile, previousProfile.SoilProfile))
+                    {
+                        log.Warn(string.Format(RingtoetsCommonIOResources.SoilModelTransformer_GetUniqueStochasticSoilProfiles_StochasticSoilProfile_0_has_multiple_occurences_in_SoilModel_1_Probability_Summed,
+                                               previousProfile.SoilProfile.Name,
+                                               soilModelName));
+
+                        previousProfile.AddProbability(currentProfile.Probability);
+                        uniqueStochasticSoilProfiles.Remove(currentProfile);
+                    }
+                }
+            }
+            catch (ArgumentOutOfRangeException e)
+            {
+                throw new ImportedDataTransformException(e.Message, e);
+            }
+
+            return uniqueStochasticSoilProfiles;
+        }
     }
 }
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