Index: Ringtoets/Migration/src/Ringtoets.Migration.Core/EmbeddedResources/Migration_17.3_18.1.sql
===================================================================
diff -u -rf9f8c1930941084de0b0010b52fc5f76ad2eaa48 -r51f87dd6a3c95498155174a81fae5ff83e1b816f
--- Ringtoets/Migration/src/Ringtoets.Migration.Core/EmbeddedResources/Migration_17.3_18.1.sql	(.../Migration_17.3_18.1.sql)	(revision f9f8c1930941084de0b0010b52fc5f76ad2eaa48)
+++ Ringtoets/Migration/src/Ringtoets.Migration.Core/EmbeddedResources/Migration_17.3_18.1.sql	(.../Migration_17.3_18.1.sql)	(revision 51f87dd6a3c95498155174a81fae5ff83e1b816f)
@@ -2577,6 +2577,63 @@
 	JOIN TempAssessmentSectionFailureMechanism AS asfm ON asfm.[FailureMechanismId] = cs.[FailureMechanismEntityId]
 	WHERE source.[IdenticalApertures] != cs.[IdenticalApertures];
 
+/*
+* Log changes that are applied to closing structure calculations
+*/
+CREATE TEMP TABLE TempMigratedStructuresCalculationGroupMapping
+(
+	'CalculationGroupEntityId' INTEGER NOT NULL,
+	'FailureMechanismEntityId' INTEGER NOT NULL,
+	PRIMARY KEY
+	(
+		'CalculationGroupEntityId'
+	)
+);
+
+INSERT INTO TempMigratedStructuresCalculationGroupMapping(
+	[CalculationGroupEntityId],
+	[FailureMechanismEntityId]
+)
+SELECT
+	[CalculationGroupEntityId],
+	[FailureMechanismEntityId]
+FROM
+(
+WITH RECURSIVE CalculationGroupEntities(CalculationGroupEntityId, ParentCalculationGroupEntityId, FailureMechanismEntityId) AS (
+SELECT
+	CalculationGroupEntityId,
+	NULL,
+	FailureMechanismEntityId
+FROM FailureMechanismEntity
+WHERE FailureMechanismEntity.FailureMechanismType = 10
+UNION ALL
+SELECT
+	CalculationGroupEntity.CalculationGroupEntityId,
+	CalculationGroupEntity.ParentCalculationGroupEntityId,
+	CalculationGroupEntities.FailureMechanismEntityId
+FROM CalculationGroupEntity, CalculationGroupEntities
+WHERE CalculationGroupEntity.ParentCalculationGroupEntityId = CalculationGroupEntities.CalculationGroupEntityId
+)
+SELECT
+	CalculationGroupEntities.CalculationGroupEntityId AS CalculationGroupEntityId,
+	CalculationGroupEntities.FailureMechanismEntityId AS FailureMechanismEntityId
+FROM CalculationGroupEntities
+ORDER BY FailureMechanismEntityId
+);
+
+INSERT INTO TempChanges
+SELECT 
+	asfm.[AssessmentSectionId],
+	asfm.[AssessmentSectionName],
+	asfm.[FailureMechanismId],
+	asfm.[FailureMechanismName],
+	"De waarde van '" || source.[IdenticalApertures] || "' van parameter 'Aantal identieke doorstroomopeningen' van berekening '" || source.[Name] || "' is ongeldig en is veranderd naar 1."
+	FROM ClosingStructuresCalculationEntity AS cs
+	JOIN [SOURCEPROJECT].ClosingStructuresCalculationEntity AS source ON cs.[rowid] = source.[rowid]
+	JOIN TempMigratedStructuresCalculationGroupMapping mapping USING(CalculationGroupEntityId)
+ 	JOIN TempAssessmentSectionFailureMechanism AS asfm ON asfm.[FailureMechanismId] = mapping.[FailureMechanismEntityId]
+	WHERE source.[IdenticalApertures] != cs.[IdenticalApertures];
+
 INSERT INTO [LOGDATABASE].MigrationLogEntity (
 	[FromVersion], 
 	[ToVersion], 
@@ -2656,6 +2713,7 @@
 
 DROP TABLE TempFailureMechanisms;
 DROP TABLE TempAssessmentSectionFailureMechanism;
+DROP TABLE TempMigratedStructuresCalculationGroupMapping;
 DROP TABLE TempChanges;
 
 INSERT INTO [LOGDATABASE].MigrationLogEntity (
Index: Ringtoets/Migration/test/Ringtoets.Migration.Integration.Test/MigrationTo181IntegrationTest.cs
===================================================================
diff -u -rf9f8c1930941084de0b0010b52fc5f76ad2eaa48 -r51f87dd6a3c95498155174a81fae5ff83e1b816f
--- Ringtoets/Migration/test/Ringtoets.Migration.Integration.Test/MigrationTo181IntegrationTest.cs	(.../MigrationTo181IntegrationTest.cs)	(revision f9f8c1930941084de0b0010b52fc5f76ad2eaa48)
+++ Ringtoets/Migration/test/Ringtoets.Migration.Integration.Test/MigrationTo181IntegrationTest.cs	(.../MigrationTo181IntegrationTest.cs)	(revision 51f87dd6a3c95498155174a81fae5ff83e1b816f)
@@ -350,7 +350,7 @@
             {
                 ReadOnlyCollection<MigrationLogMessage> messages = reader.GetMigrationLogMessages();
 
-                Assert.AreEqual(65, messages.Count);
+                Assert.AreEqual(66, messages.Count);
                 var i = 0;
                 MigrationLogTestHelper.AssertMigrationLogMessageEqual(
                     new MigrationLogMessage("17.3", newVersion, "Gevolgen van de migratie van versie 17.3 naar versie 18.1:"),
@@ -579,6 +579,9 @@
                     new MigrationLogMessage("17.3", newVersion, "  + Toetsspoor: 'Betrouwbaarheid sluiting kunstwerk'"),
                     messages[i++]);
                 MigrationLogTestHelper.AssertMigrationLogMessageEqual(
+                    new MigrationLogMessage("17.3", newVersion, "    - De waarde van '0' van parameter 'Aantal identieke doorstroomopeningen' van berekening 'Invalid Identical Apertures' is ongeldig en is veranderd naar 1."),
+                    messages[i++]);
+                MigrationLogTestHelper.AssertMigrationLogMessageEqual(
                     new MigrationLogMessage("17.3", newVersion, "    - De waarde van '0' van parameter 'Aantal identieke doorstroomopeningen' van kunstwerk 'Gemaal Leemans' is ongeldig en is veranderd naar 1."),
                     messages[i++]);
                 MigrationLogTestHelper.AssertMigrationLogMessageEqual(