Index: Ringtoets/Migration/src/Ringtoets.Migration.Core/EmbeddedResources/Migration_18.1_18.2.sql
===================================================================
diff -u -r4abfa78a7646ed9974c1765f39da457eb3bfd283 -r5ec3bc519497b68a2905a9267fd36bfed53b04eb
--- Ringtoets/Migration/src/Ringtoets.Migration.Core/EmbeddedResources/Migration_18.1_18.2.sql	(.../Migration_18.1_18.2.sql)	(revision 4abfa78a7646ed9974c1765f39da457eb3bfd283)
+++ Ringtoets/Migration/src/Ringtoets.Migration.Core/EmbeddedResources/Migration_18.1_18.2.sql	(.../Migration_18.1_18.2.sql)	(revision 5ec3bc519497b68a2905a9267fd36bfed53b04eb)
@@ -8,7 +8,26 @@
 ATTACH DATABASE "{0}" AS SOURCEPROJECT;
 
 INSERT INTO AssessmentSectionEntity SELECT * FROM [SOURCEPROJECT].AssessmentSectionEntity;
-INSERT INTO BackgroundDataEntity SELECT * FROM [SOURCEPROJECT].BackgroundDataEntity;
+INSERT INTO BackgroundDataEntity (
+	[BackgroundDataEntityId],
+	[AssessmentSectionEntityId],
+	[Name],
+	[IsVisible],
+	[Transparency],
+	[BackgroundDataType])
+SELECT 
+	[BackgroundDataEntityId],
+	[AssessmentSectionEntityId],
+	[Name],
+	[IsVisible],
+	CASE 
+		WHEN [Transparency] > 0 
+			THEN [Transparency]
+	ELSE 
+		0.6
+	END,
+	[BackgroundDataType]
+FROM [SOURCEPROJECT].BackgroundDataEntity;
 INSERT INTO BackgroundDataMetaEntity SELECT * FROM [SOURCEPROJECT].BackgroundDataMetaEntity;
 INSERT INTO CalculationGroupEntity SELECT * FROM [SOURCEPROJECT].CalculationGroupEntity;
 INSERT INTO ClosingStructureEntity SELECT * FROM [SOURCEPROJECT].ClosingStructureEntity;
Index: Ringtoets/Migration/test/Ringtoets.Migration.Core.Test/test-data/MigrationTestProject181.rtd
===================================================================
diff -u -r4abfa78a7646ed9974c1765f39da457eb3bfd283 -r5ec3bc519497b68a2905a9267fd36bfed53b04eb
Binary files differ
Index: Ringtoets/Migration/test/Ringtoets.Migration.Integration.Test/MigrationTo182IntegrationTest.cs
===================================================================
diff -u -r4abfa78a7646ed9974c1765f39da457eb3bfd283 -r5ec3bc519497b68a2905a9267fd36bfed53b04eb
--- Ringtoets/Migration/test/Ringtoets.Migration.Integration.Test/MigrationTo182IntegrationTest.cs	(.../MigrationTo182IntegrationTest.cs)	(revision 4abfa78a7646ed9974c1765f39da457eb3bfd283)
+++ Ringtoets/Migration/test/Ringtoets.Migration.Integration.Test/MigrationTo182IntegrationTest.cs	(.../MigrationTo182IntegrationTest.cs)	(revision 5ec3bc519497b68a2905a9267fd36bfed53b04eb)
@@ -59,12 +59,46 @@
 
                     AssertVersions(reader);
                     AssertDatabase(reader);
+
+                    AssertBackgroundData(reader, sourceFilePath);
                 }
 
                 AssertLogDatabase(logFilePath);
             }
         }
 
+        private static void AssertBackgroundData(MigratedDatabaseReader reader, string sourceFilePath)
+        {
+            string validateTransparency =
+                $"ATTACH DATABASE \"{sourceFilePath}\" AS SOURCEPROJECT;" +
+                "SELECT SUM([IsInvalid]) = 0 " +
+                "FROM " +
+                "(" +
+                "SELECT " +
+                "CASE WHEN (NEW.[Transparency] = OLD.[Transparency] AND OLD.[Transparency] > 0) " +
+                "OR (NEW.[Transparency] = 0.6 AND OLD.[Transparency] = 0) " +
+                "THEN 0 " +
+                "ELSE 1 " +
+                "END AS [IsInvalid] " +
+                "FROM BackgroundDataEntity NEW " +
+                "JOIN [SOURCEPROJECT].BackgroundDataEntity OLD USING(BackgroundDataEntityId) " +
+                "); " +
+                "DETACH SOURCEPROJECT;";
+            reader.AssertReturnedDataIsValid(validateTransparency);
+
+            string validateBackgroundData =
+                $"ATTACH DATABASE \"{sourceFilePath}\" AS SOURCEPROJECT;" +
+                "SELECT COUNT() = (SELECT COUNT() FROM [SOURCEPROJECT].BackgroundDataEntity) " +
+                "FROM BackgroundDataEntity NEW " +
+                "JOIN [SOURCEPROJECT].BackgroundDataEntity OLD USING(BackgroundDataEntityId) " +
+                "WHERE NEW.[AssessmentSectionEntityId] = OLD.[AssessmentSectionEntityId] " +
+                "AND NEW.[Name] = OLD.[Name] " +
+                "AND NEW.[IsVisible] = OLD.[IsVisible] " +
+                "AND NEW.[BackgroundDataType] = OLD.[BackgroundDataType]; " +
+                "DETACH SOURCEPROJECT;";
+            reader.AssertReturnedDataIsValid(validateBackgroundData);
+        }
+
         private static void AssertTablesContentMigrated(MigratedDatabaseReader reader, string sourceFilePath)
         {
             string[] tables =