diff --git a/DBPatch/sqlScripts/SystemX.DB.UniqueKeyDB_Create.sql b/DBPatch/sqlScripts/SystemX.DB.UniqueKeyDB_Create.sql
index 16a77b7..7b89f16 100644
--- a/DBPatch/sqlScripts/SystemX.DB.UniqueKeyDB_Create.sql
+++ b/DBPatch/sqlScripts/SystemX.DB.UniqueKeyDB_Create.sql
@@ -266,7 +266,7 @@ PRINT N'테이블 [dbo].[tPairKeyStorage]을(를) 만드는 중...';
 GO
 CREATE TABLE [dbo].[tPairKeyStorage] (
     [cPrimaryKey]   NVARCHAR (50)  NOT NULL,
-    [cSecondaryKey] NVARCHAR (50)  NOT NULL,
+    [cSecondaryKey] NVARCHAR (50)  NULL,
     [cValue1]       NVARCHAR (200) NULL,
     [cValue2]       NVARCHAR (200) NULL,
     [cDateTime]     DATETIME2 (7)  NOT NULL,
diff --git a/DBPatch/sqlScripts/SystemX.DB.UniqueKeyDB_Update.sql b/DBPatch/sqlScripts/SystemX.DB.UniqueKeyDB_Update.sql
index cb366bc..67e9acf 100644
--- a/DBPatch/sqlScripts/SystemX.DB.UniqueKeyDB_Update.sql
+++ b/DBPatch/sqlScripts/SystemX.DB.UniqueKeyDB_Update.sql
@@ -42,19 +42,28 @@ USE [$(DatabaseName)];
 
 
 GO
-PRINT N'테이블 [dbo].[tPairKeyStorage]을(를) 만드는 중...';
+PRINT N'UNIQUE 제약 조건 [dbo].[UQ_cMacAddress]을(를) 삭제하는 중...';
 
 
 GO
-CREATE TABLE [dbo].[tPairKeyStorage] (
-    [cPrimaryKey]   NVARCHAR (50)  NOT NULL,
-    [cSecondaryKey] NVARCHAR (50)  NOT NULL,
-    [cValue1]       NVARCHAR (200) NULL,
-    [cValue2]       NVARCHAR (200) NULL,
-    [cDateTime]     DATETIME2 (7)  NOT NULL,
-    CONSTRAINT [PK_cProductKey] PRIMARY KEY CLUSTERED ([cPrimaryKey] ASC),
-    CONSTRAINT [UQ_cMacAddress] UNIQUE NONCLUSTERED ([cSecondaryKey] ASC)
-);
+ALTER TABLE [dbo].[tPairKeyStorage] DROP CONSTRAINT [UQ_cMacAddress];
+
+
+GO
+PRINT N'테이블 [dbo].[tPairKeyStorage]을(를) 변경하는 중...';
+
+
+GO
+ALTER TABLE [dbo].[tPairKeyStorage] ALTER COLUMN [cSecondaryKey] NVARCHAR (50) NULL;
+
+
+GO
+PRINT N'UNIQUE 제약 조건 [dbo].[UQ_cMacAddress]을(를) 만드는 중...';
+
+
+GO
+ALTER TABLE [dbo].[tPairKeyStorage]
+    ADD CONSTRAINT [UQ_cMacAddress] UNIQUE NONCLUSTERED ([cSecondaryKey] ASC);
 
 
 GO
diff --git a/DBPatch/sqlScripts/dacpac/SystemX.DB.AccountDB.dacpac b/DBPatch/sqlScripts/dacpac/SystemX.DB.AccountDB.dacpac
index c9cf4a8..c3fd36a 100644
Binary files a/DBPatch/sqlScripts/dacpac/SystemX.DB.AccountDB.dacpac and b/DBPatch/sqlScripts/dacpac/SystemX.DB.AccountDB.dacpac differ
diff --git a/DBPatch/sqlScripts/dacpac/SystemX.DB.CPXV2.dacpac b/DBPatch/sqlScripts/dacpac/SystemX.DB.CPXV2.dacpac
index c069279..5aed60d 100644
Binary files a/DBPatch/sqlScripts/dacpac/SystemX.DB.CPXV2.dacpac and b/DBPatch/sqlScripts/dacpac/SystemX.DB.CPXV2.dacpac differ
diff --git a/DBPatch/sqlScripts/dacpac/SystemX.DB.CPXV2Log.dacpac b/DBPatch/sqlScripts/dacpac/SystemX.DB.CPXV2Log.dacpac
index 0c58b7d..1ab7f29 100644
Binary files a/DBPatch/sqlScripts/dacpac/SystemX.DB.CPXV2Log.dacpac and b/DBPatch/sqlScripts/dacpac/SystemX.DB.CPXV2Log.dacpac differ
diff --git a/DBPatch/sqlScripts/dacpac/SystemX.DB.UniqueKeyDB.dacpac b/DBPatch/sqlScripts/dacpac/SystemX.DB.UniqueKeyDB.dacpac
index 3e83a9f..bfb4397 100644
Binary files a/DBPatch/sqlScripts/dacpac/SystemX.DB.UniqueKeyDB.dacpac and b/DBPatch/sqlScripts/dacpac/SystemX.DB.UniqueKeyDB.dacpac differ
diff --git a/DBPatch/sqlScripts/dacpac/SystemX.DB.VPKI_DataDB.dacpac b/DBPatch/sqlScripts/dacpac/SystemX.DB.VPKI_DataDB.dacpac
index 25df9bd..fe24750 100644
Binary files a/DBPatch/sqlScripts/dacpac/SystemX.DB.VPKI_DataDB.dacpac and b/DBPatch/sqlScripts/dacpac/SystemX.DB.VPKI_DataDB.dacpac differ
diff --git a/Projects/DLL/SystemX.Core.DB.dll b/Projects/DLL/SystemX.Core.DB.dll
index b8b1118..12d8698 100644
Binary files a/Projects/DLL/SystemX.Core.DB.dll and b/Projects/DLL/SystemX.Core.DB.dll differ
diff --git a/Projects/DLL/SystemX.Core.dll b/Projects/DLL/SystemX.Core.dll
index 6f25c2b..f65683e 100644
Binary files a/Projects/DLL/SystemX.Core.dll and b/Projects/DLL/SystemX.Core.dll differ
diff --git a/Projects/SystemX.Core/DB/SystemX.DB.UniqueKeyDB/dbo/Tables/tPairKeyStorage.sql b/Projects/SystemX.Core/DB/SystemX.DB.UniqueKeyDB/dbo/Tables/tPairKeyStorage.sql
index ce917fb..1ff306f 100644
--- a/Projects/SystemX.Core/DB/SystemX.DB.UniqueKeyDB/dbo/Tables/tPairKeyStorage.sql
+++ b/Projects/SystemX.Core/DB/SystemX.DB.UniqueKeyDB/dbo/Tables/tPairKeyStorage.sql
@@ -1,7 +1,7 @@
 CREATE TABLE [dbo].[tPairKeyStorage]
 (
 	[cPrimaryKey] NVARCHAR(50) NOT NULL,
-	[cSecondaryKey] NVARCHAR(50) NOT NULL,
+	[cSecondaryKey] NVARCHAR(50) NULL,
 	[cValue1] NVARCHAR(200),
 	[cValue2] NVARCHAR(200),
 	[cDateTime] DATETIME2 NOT NULL,	
diff --git a/Projects/SystemX.Core/SystemX.Core.DB/UniqueKeyDB/Tables/tPairKeyStorage.cs b/Projects/SystemX.Core/SystemX.Core.DB/UniqueKeyDB/Tables/tPairKeyStorage.cs
index cb30c1d..b768c4e 100644
--- a/Projects/SystemX.Core/SystemX.Core.DB/UniqueKeyDB/Tables/tPairKeyStorage.cs
+++ b/Projects/SystemX.Core/SystemX.Core.DB/UniqueKeyDB/Tables/tPairKeyStorage.cs
@@ -7,7 +7,7 @@ public partial class tPairKeyStorage
 {
     public string cPrimaryKey { get; set; } = null!;
 
-    public string cSecondaryKey { get; set; } = null!;
+    public string? cSecondaryKey { get; set; }
 
     public string? cValue1 { get; set; }