Rename failed for user 'dbo' -MS SQL ERROR 15150

SQL SERVER 2016修改“User Mapping"时报错：

TITLE: Microsoft SQL Server Management Studio
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Rename failed for User 'dbo'.  (Microsoft.SqlServer.Smo)

For help, click: https://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=16.100.37971.0&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&EvtID=Rename+User&LinkId=20476

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ADDITIONAL INFORMATION:

An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)

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Cannot alter the user 'dbo'. (Microsoft SQL Server, Error: 15150)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft%20SQL%20Server&ProdVer=13.00.5026&EvtSrc=MSSQLServer&EvtID=15150&LinkId=20476

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BUTTONS:

OK
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解决方法：

以SA登录SQL SERVER STUDIO,执行下面的命令：

use testdatabaseName
EXEC sp_changedbowner 'sa','true'