diff --git a/src/EFCore.Relational/Metadata/Internal/RelationalModel.cs b/src/EFCore.Relational/Metadata/Internal/RelationalModel.cs
index b635b1711b8..84d7f48e9eb 100644
--- a/src/EFCore.Relational/Metadata/Internal/RelationalModel.cs
+++ b/src/EFCore.Relational/Metadata/Internal/RelationalModel.cs
@@ -1133,21 +1133,18 @@ private static StoredProcedureMapping CreateStoredProcedureMapping(
                     entityType.GetMappingStrategy() == RelationalAnnotationNames.TphMappingStrategy,
                     "Expected TPH for " + entityType.DisplayName());
 
-                if (entityType.BaseType == null)
+                foreach (var derivedProperty in entityType.GetRootType().GetDerivedProperties())
                 {
-                    foreach (var derivedProperty in entityType.GetDerivedProperties())
+                    if (derivedProperty.Name == parameter.PropertyName)
                     {
-                        if (derivedProperty.Name == parameter.PropertyName)
-                        {
-                            GetOrCreateStoreStoredProcedureParameter(
-                                parameter,
-                                derivedProperty,
-                                position,
-                                storeStoredProcedure,
-                                identifier,
-                                relationalTypeMappingSource);
-                            break;
-                        }
+                        GetOrCreateStoreStoredProcedureParameter(
+                            parameter,
+                            derivedProperty,
+                            position,
+                            storeStoredProcedure,
+                            identifier,
+                            relationalTypeMappingSource);
+                        break;
                     }
                 }
 
@@ -1201,21 +1198,18 @@ private static StoredProcedureMapping CreateStoredProcedureMapping(
                     entityType.GetMappingStrategy() == RelationalAnnotationNames.TphMappingStrategy,
                     "Expected TPH for " + entityType.DisplayName());
 
-                if (entityType.BaseType == null)
+                foreach (var derivedProperty in entityType.GetRootType().GetDerivedProperties())
                 {
-                    foreach (var derivedProperty in entityType.GetDerivedProperties())
+                    if (derivedProperty.Name == resultColumn.PropertyName)
                     {
-                        if (derivedProperty.Name == resultColumn.PropertyName)
-                        {
-                            GetOrCreateStoreStoredProcedureResultColumn(
-                                resultColumn,
-                                derivedProperty,
-                                position,
-                                storeStoredProcedure,
-                                identifier,
-                                relationalTypeMappingSource);
-                            break;
-                        }
+                        GetOrCreateStoreStoredProcedureResultColumn(
+                            resultColumn,
+                            derivedProperty,
+                            position,
+                            storeStoredProcedure,
+                            identifier,
+                            relationalTypeMappingSource);
+                        break;
                     }
                 }
 
diff --git a/test/EFCore.Relational.Specification.Tests/Update/StoredProcedureUpdateFixtureBase.cs b/test/EFCore.Relational.Specification.Tests/Update/StoredProcedureUpdateFixtureBase.cs
index 15909628c88..ea5621967f1 100644
--- a/test/EFCore.Relational.Specification.Tests/Update/StoredProcedureUpdateFixtureBase.cs
+++ b/test/EFCore.Relational.Specification.Tests/Update/StoredProcedureUpdateFixtureBase.cs
@@ -198,9 +198,9 @@ protected override void OnModelCreating(ModelBuilder modelBuilder, DbContext con
                         .HasParameter(w => w.Id, pb => pb.IsOutput())
                         .HasParameter("Discriminator")
                         .HasParameter(w => w.Name)
-                        .HasParameter(nameof(TphChild1.Child1Property))
                         .HasParameter(nameof(TphChild2.Child2InputProperty))
                         .HasParameter(nameof(TphChild2.Child2OutputParameterProperty), o => o.IsOutput())
+                        .HasParameter(nameof(TphChild1.Child1Property))
                         .HasResultColumn(nameof(TphChild2.Child2ResultColumnProperty)));
             });
 
diff --git a/test/EFCore.SqlServer.FunctionalTests/Update/StoredProcedureUpdateSqlServerTest.cs b/test/EFCore.SqlServer.FunctionalTests/Update/StoredProcedureUpdateSqlServerTest.cs
index 89a11a91daa..6dfd279bc28 100644
--- a/test/EFCore.SqlServer.FunctionalTests/Update/StoredProcedureUpdateSqlServerTest.cs
+++ b/test/EFCore.SqlServer.FunctionalTests/Update/StoredProcedureUpdateSqlServerTest.cs
@@ -306,12 +306,12 @@ public override async Task Tph(bool async)
             @"@p0=NULL (Nullable = false) (Direction = Output) (DbType = Int32)
 @p1='TphChild1' (Nullable = false) (Size = 4000)
 @p2='Child' (Size = 4000)
-@p3='8' (Nullable = true)
-@p4=NULL (DbType = Int32)
-@p5=NULL (Direction = Output) (DbType = Int32)
+@p3=NULL (DbType = Int32)
+@p4=NULL (Direction = Output) (DbType = Int32)
+@p5='8' (Nullable = true)
 
 SET NOCOUNT ON;
-EXEC [Tph_Insert] @p0 OUTPUT, @p1, @p2, @p3, @p4, @p5 OUTPUT;");
+EXEC [Tph_Insert] @p0 OUTPUT, @p1, @p2, @p3, @p4 OUTPUT, @p5;");
     }
 
     public override async Task Tpt(bool async)
@@ -576,7 +576,7 @@ IF @Name IS NULL
 
 GO
 
-CREATE PROCEDURE Tph_Insert(@Id int OUT, @Discriminator varchar(max), @Name varchar(max), @Child1Property int, @Child2InputProperty int, @Child2OutputParameterProperty int OUT)
+CREATE PROCEDURE Tph_Insert(@Id int OUT, @Discriminator varchar(max), @Name varchar(max), @Child2InputProperty int, @Child2OutputParameterProperty int OUT, @Child1Property int)
 AS BEGIN
     DECLARE @Table table ([Child2OutputParameterProperty] int);
     INSERT INTO [Tph] ([Discriminator], [Name], [Child1Property], [Child2InputProperty]) OUTPUT [Inserted].[Child2OutputParameterProperty] INTO @Table VALUES (@Discriminator, @Name, @Child1Property, @Child2InputProperty);