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MS SQL Syntax Merge

I wrote a merge query following this example, I get the same error message as this sample gives me. The error is
Msg 102, Level 15, State 1, Line 4
Incorrect syntax near '.'.
Msg 156, Level 15, State 1, Line 10
Incorrect syntax near the keyword 'AS'.

This sample is taken directly off the MS web site.
INSERT INTO Production.UpdatedInventory
SELECT ProductID, LocationID, NewQty, PreviousQty
FROM
(    MERGE Production.ProductInventory AS pi
     USING (SELECT ProductID, SUM(OrderQty)
            FROM Sales.SalesOrderDetail AS sod
            JOIN Sales.SalesOrderHeader AS soh
            ON sod.SalesOrderID = soh.SalesOrderID
            AND soh.OrderDate BETWEEN '20030701' AND '20030731'
            GROUP BY ProductID) AS src (ProductID, OrderQty)
     ON pi.ProductID = src.ProductID
    WHEN MATCHED AND pi.Quantity - src.OrderQty >= 0
        THEN UPDATE SET pi.Quantity = pi.Quantity - src.OrderQty
    WHEN MATCHED AND pi.Quantity - src.OrderQty <= 0
        THEN DELETE
    OUTPUT $action, Inserted.ProductID, Inserted.LocationID, Inserted.Quantity AS NewQty, Deleted.Quantity AS PreviousQty)
 AS Changes (Action, ProductID, LocationID, NewQty, PreviousQty) WHERE Action = 'UPDATE';

Can someone please identify the error?
SOLUTION
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Patrick Tallarico
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Adventureworks is the database and Production is the schema. I had tried in my example with and without the databasename and schema and it still does not work.

INSERT INTO Adventureworks.Production.UpdatedInventory
SELECT ProductID, LocationID, NewQty, PreviousQty
FROM
(    MERGE Adventureworks.Production.ProductInventory AS pi
     USING (SELECT ProductID, SUM(OrderQty)
            FROM Sales.SalesOrderDetail AS sod
            JOIN Sales.SalesOrderHeader AS soh
            ON sod.SalesOrderID = soh.SalesOrderID
            AND soh.OrderDate BETWEEN '20030701' AND '20030731'
            GROUP BY ProductID) AS src (ProductID, OrderQty)
     ON pi.ProductID = src.ProductID
    WHEN MATCHED AND pi.Quantity - src.OrderQty >= 0
        THEN UPDATE SET pi.Quantity = pi.Quantity - src.OrderQty
    WHEN MATCHED AND pi.Quantity - src.OrderQty <= 0
        THEN DELETE
    OUTPUT $action, Inserted.ProductID, Inserted.LocationID, Inserted.Quantity AS NewQty, Deleted.Quantity AS PreviousQty)
 AS Changes (Action, ProductID, LocationID, NewQty, PreviousQty) WHERE Action = 'UPDATE';
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