Index: Ringtoets/Integration/src/Ringtoets.Integration.Forms/Dialogs/MergeDataProviderStub.Designer.cs
===================================================================
diff -u -r0abc3d3c19968df4450672ef585b3262d00b3ff8 -rffc7f186d2cd1e12f3d0724fa241a524e8e0f561
--- Ringtoets/Integration/src/Ringtoets.Integration.Forms/Dialogs/MergeDataProviderStub.Designer.cs	(.../MergeDataProviderStub.Designer.cs)	(revision 0abc3d3c19968df4450672ef585b3262d00b3ff8)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Forms/Dialogs/MergeDataProviderStub.Designer.cs	(.../MergeDataProviderStub.Designer.cs)	(revision ffc7f186d2cd1e12f3d0724fa241a524e8e0f561)
@@ -54,11 +54,13 @@
             this.flowLayoutPanel = new System.Windows.Forms.FlowLayoutPanel();
             this.okButton = new System.Windows.Forms.Button();
             this.cancelButton = new System.Windows.Forms.Button();
+            this.mergeInfoLabel = new System.Windows.Forms.Label();
             this.flowLayoutPanel.SuspendLayout();
             this.SuspendLayout();
             // 
             // flowLayoutPanel
             // 
+            this.flowLayoutPanel.Controls.Add(this.mergeInfoLabel);
             this.flowLayoutPanel.Controls.Add(this.okButton);
             this.flowLayoutPanel.Controls.Add(this.cancelButton);
             this.flowLayoutPanel.Location = new System.Drawing.Point(3, 3);
@@ -68,8 +70,8 @@
             // 
             // okButton
             // 
-            this.okButton.DialogResult = DialogResult.OK;
-            this.okButton.Location = new System.Drawing.Point(3, 3);
+            this.okButton.DialogResult = System.Windows.Forms.DialogResult.OK;
+            this.okButton.Location = new System.Drawing.Point(3, 29);
             this.okButton.Name = "okButton";
             this.okButton.Size = new System.Drawing.Size(197, 23);
             this.okButton.TabIndex = 0;
@@ -78,14 +80,24 @@
             // 
             // cancelButton
             // 
-            this.cancelButton.DialogResult = DialogResult.Cancel;
-            this.cancelButton.Location = new System.Drawing.Point(3, 32);
+            this.cancelButton.DialogResult = System.Windows.Forms.DialogResult.Cancel;
+            this.cancelButton.Location = new System.Drawing.Point(3, 58);
             this.cancelButton.Name = "cancelButton";
             this.cancelButton.Size = new System.Drawing.Size(197, 23);
             this.cancelButton.TabIndex = 1;
             this.cancelButton.Text = "Annuleren";
             this.cancelButton.UseVisualStyleBackColor = true;
             // 
+            // mergeInfoLabel
+            // 
+            this.mergeInfoLabel.AutoSize = true;
+            this.mergeInfoLabel.Location = new System.Drawing.Point(3, 0);
+            this.mergeInfoLabel.Name = "mergeInfoLabel";
+            this.mergeInfoLabel.Size = new System.Drawing.Size(164, 26);
+            this.mergeInfoLabel.TabIndex = 2;
+            this.mergeInfoLabel.Text = "De hydraulische belastingen uit het nieuwe project zal worden overgenomen.";
+            this.mergeInfoLabel.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
+            // 
             // MergeDataProviderStub
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
@@ -94,6 +106,7 @@
             this.Name = "MergeDataProviderStub";
             this.Size = new System.Drawing.Size(212, 111);
             this.flowLayoutPanel.ResumeLayout(false);
+            this.flowLayoutPanel.PerformLayout();
             this.ResumeLayout(false);
 
         }
@@ -103,5 +116,6 @@
         private System.Windows.Forms.FlowLayoutPanel flowLayoutPanel;
         private System.Windows.Forms.Button okButton;
         private System.Windows.Forms.Button cancelButton;
+        private Label mergeInfoLabel;
     }
 }
\ No newline at end of file
Index: Ringtoets/Integration/src/Ringtoets.Integration.Forms/Dialogs/MergeDataProviderStub.cs
===================================================================
diff -u -r0abc3d3c19968df4450672ef585b3262d00b3ff8 -rffc7f186d2cd1e12f3d0724fa241a524e8e0f561
--- Ringtoets/Integration/src/Ringtoets.Integration.Forms/Dialogs/MergeDataProviderStub.cs	(.../MergeDataProviderStub.cs)	(revision 0abc3d3c19968df4450672ef585b3262d00b3ff8)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Forms/Dialogs/MergeDataProviderStub.cs	(.../MergeDataProviderStub.cs)	(revision ffc7f186d2cd1e12f3d0724fa241a524e8e0f561)
@@ -20,9 +20,9 @@
 // All rights reserved.
 
 using System.Collections.Generic;
+using System.Linq;
 using System.Windows.Forms;
 using Core.Common.Controls.Dialogs;
-using Ringtoets.Common.Data.AssessmentSection;
 using Ringtoets.Common.Data.FailureMechanism;
 using Ringtoets.Integration.Data;
 using Ringtoets.Integration.Forms.Merge;
@@ -40,7 +40,7 @@
         /// </summary>
         /// <param name="dialogParent"></param>
         public MergeDataProviderStub(IWin32Window dialogParent)
-            : base(dialogParent, RingtoetsCommonFormsResources.SelectionDialogIcon, 1, 1)
+            : base(dialogParent, RingtoetsCommonFormsResources.SelectionDialogIcon, 160, 160)
         {
             InitializeComponent();
         }
@@ -53,11 +53,13 @@
         {
             if (ShowDialog() == DialogResult.OK)
             {
-                SelectedAssessmentSection = new AssessmentSection(AssessmentSectionComposition.Dike);
-                SelectedFailureMechanisms = new List<IFailureMechanism>
-                {
-                    SelectedAssessmentSection.Piping
-                };
+                SelectedAssessmentSection = assessmentSections?.First();
+                SelectedFailureMechanisms = assessmentSections != null
+                                                ? new List<IFailureMechanism>
+                                                {
+                                                    SelectedAssessmentSection.Piping
+                                                }
+                                                : null;
                 return true;
             }
 
Index: Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Dialogs/MergeDataProviderStubTest.cs
===================================================================
diff -u -r0abc3d3c19968df4450672ef585b3262d00b3ff8 -rffc7f186d2cd1e12f3d0724fa241a524e8e0f561
--- Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Dialogs/MergeDataProviderStubTest.cs	(.../MergeDataProviderStubTest.cs)	(revision 0abc3d3c19968df4450672ef585b3262d00b3ff8)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Dialogs/MergeDataProviderStubTest.cs	(.../MergeDataProviderStubTest.cs)	(revision ffc7f186d2cd1e12f3d0724fa241a524e8e0f561)
@@ -19,11 +19,14 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System.Linq;
 using System.Windows.Forms;
 using Core.Common.Controls.Dialogs;
 using NUnit.Extensions.Forms;
 using NUnit.Framework;
 using Rhino.Mocks;
+using Ringtoets.Common.Data.AssessmentSection;
+using Ringtoets.Integration.Data;
 using Ringtoets.Integration.Forms.Dialogs;
 using Ringtoets.Integration.Forms.Merge;
 
@@ -73,18 +76,18 @@
                 provider.SelectData(null);
 
                 // Assert
-                var okButton = (Button)new ButtonTester("okButton", provider).TheObject;
+                var label = (Label) new LabelTester("mergeInfoLabel", provider).TheObject;
+                Assert.AreEqual("De hydraulische belastingen uit het nieuwe project zal worden overgenomen.", label.Text);
+
+                var okButton = (Button) new ButtonTester("okButton", provider).TheObject;
                 Assert.AreEqual("Ok", okButton.Text);
                 Assert.IsTrue(okButton.Enabled);
 
                 Assert.AreEqual("Annuleren", cancelButton.Text);
                 Assert.AreEqual(cancelButton, provider.CancelButton);
 
-                Assert.AreEqual(1, provider.MinimumSize.Width);
-                Assert.AreEqual(1, provider.MinimumSize.Height);
-
-                Assert.AreEqual(1, provider.MinimumSize.Width);
-                Assert.AreEqual(1, provider.MinimumSize.Height);
+                Assert.AreEqual(160, provider.MinimumSize.Width);
+                Assert.AreEqual(160, provider.MinimumSize.Height);
             }
         }
 
@@ -105,7 +108,7 @@
             using (var provider = new MergeDataProviderStub(dialogParent))
             {
                 // When
-                bool dataSelected= provider.SelectData(null);
+                bool dataSelected = provider.SelectData(null);
 
                 // Then
                 Assert.IsFalse(dataSelected);
@@ -137,7 +140,7 @@
         }
 
         [Test]
-        public void GivenDialog_WhenOkPressed_ThenSelectionPropertiesSet()
+        public void GivenDialog_WhenAssessmentSectionsGivenAndOkPressed_ThenSelectionPropertiesSet()
         {
             // Given
             DialogBoxHandler = (name, wnd) =>
@@ -149,6 +152,11 @@
                 }
             };
 
+            var assessmentSections = new[]
+            {
+                new AssessmentSection(AssessmentSectionComposition.Dike)
+            };
+
             using (var dialogParent = new Form())
             using (var provider = new MergeDataProviderStub(dialogParent))
             {
@@ -157,15 +165,44 @@
                 Assert.IsNull(provider.SelectedAssessmentSection);
 
                 // When
-                provider.SelectData(null);
+                provider.SelectData(assessmentSections);
 
                 // Then
-                Assert.IsNotNull(provider.SelectedAssessmentSection);
+                Assert.AreEqual(assessmentSections.First(), provider.SelectedAssessmentSection);
                 CollectionAssert.AreEqual(new[]
                 {
                     provider.SelectedAssessmentSection.Piping
                 }, provider.SelectedFailureMechanisms);
             }
         }
+
+        [Test]
+        public void GivenDialog_WhenNullGivenAndOkPressed_ThenSelectionPropertiesSetToNull()
+        {
+            // Given
+            DialogBoxHandler = (name, wnd) =>
+            {
+                using (new FormTester(name))
+                {
+                    var button = new ButtonTester("okButton", name);
+                    button.Click();
+                }
+            };
+
+            using (var dialogParent = new Form())
+            using (var provider = new MergeDataProviderStub(dialogParent))
+            {
+                // Precondition
+                Assert.IsNull(provider.SelectedAssessmentSection);
+                Assert.IsNull(provider.SelectedAssessmentSection);
+
+                // When
+                provider.SelectData(null);
+
+                // Then
+                Assert.IsNull(provider.SelectedAssessmentSection);
+                Assert.IsNull(provider.SelectedAssessmentSection);
+            }
+        }
     }
 }
\ No newline at end of file