how can I use aggregate functions in an inner join model?

there are two tables named 'production.product' and 'sales.sales order detail'
they should be joined with inner-join model:

SELECT SO.ProductID,P.NAME, MAX(ORDERQTY) FROM Sales.SalesOrderDetail SO
INNER JOIN PRODUCTION.PRODUCT P
ON SO.PRODUCTID=P.PRODUCTID
GO
NOW THERE IS A PROBLEM: I dont know how to use MAX FUNCTION with GROUP BY in an inner join
would you please help me to write the correct syntax?