SQL Syntax for Update by Ranking by Quote and Customer

I was working on a script to mark old quotes as inactive but I ran into this bump. Quotes can be duplicated for the same customer or for a different customer. My current script works fine assuming the customer number is the same but breaks down if the customer number is different. For example:

CUSTOMER_NUMBER    QUOTE_NUMBER   SEQUENCE_NUMBER
100,20150100001,0
100,20150100001,1
100,20150100001,2

In this case the first two quotes need to be set to inactive because when the quote was duplicated it was for the same customer.

CUSTOMER_NUMBER    QUOTE_NUMBER   SEQUENCE_NUMBER
100,20150100001,0
101,20150100001,1
102,20150100001,2
100,20150100001,3

In this case, only the first quote would be set to inactive because there is a higher sequence number for the same quote number and customer number. Quotes two and three are not to be set to inactive because even though the quote numbers are the same the customer number is different.

I tried changing the ranking to include the customer number but it still updates the same number of records. How do I update this script to only set duplicate quotes for the same customer?

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UPDATE CSTQUTHD
SET INACTIVE=1
FROM CSTQUTHD T1
INNER JOIN
(
  SELECT
            QUOTE_NUMBER
          , SEQUENCE_NUMBER
          , REVALIDATE_NUMB
          , ROW_NUMBER() OVER (PARTITION BY QUOTE_NUMBER
                              ORDER BY SEQUENCE_NUMBER DESC) AS VersionRank
  FROM CSTQUTHD
) as T2
  ON T1.QUOTE_NUMBER=T2.QUOTE_NUMBER AND T1.SEQUENCE_NUMBER=T2.SEQUENCE_NUMBER AND T1.REVALIDATE_NUMB=T2.REVALIDATE_NUMB
  WHERE T2.VersionRank>1