TFS_SCHEMA_VERSION Problem while updating tfs 2010 to sp1

I'd applied the SP1 to an installed RTM version and when I try to access to the team server, an error indicating bad TFS_SCHEMA_VERSION occurs:

The requested schema property TFS_SCHEMA_VERSION did not match 开发者_如何学编程the expected value. The server requires the Microsoft Team Foundation Server 2010 (SP1) schema but the database currently implements Microsoft Team Foundation Server 2010 (RTM).

I've found a trick that seems to work, I just change the advanced properties of the Default collections database.
To to that:

• I connect to the SQL Server where is the tfs connected
• Change its extended property called TFS_SCHEMA_VERSION to the value that TFS expects, i.e, change the RTM that is between brachets to SP1
• Commit changes and it works

It works fine for me...