In Designer, when validating a transformation that has compound criteria in an ansi join statement's ON, the parentheses are removed and the order of operations is modified as a result. This does not appear to occur when using the same parentheses structure in WHERE criteria.

Before validation:
SELECT * FROM bqt.SMALLA AS a INNER JOIN bqt.SMALLB AS b ON (a.INTKEY = b.INTKEY) AND (a.INTNUM IS NULL OR a.INTNUM = 11)

After validation:
SELECT * FROM bqt.SMALLA AS a INNER JOIN bqt.SMALLB AS b ON a.INTKEY = b.INTKEY AND (a.INTNUM IS NULL) OR (a.INTNUM = 11)

After validating a second time:
SELECT * FROM bqt.SMALLA AS a INNER JOIN bqt.SMALLB AS b ON ((a.INTKEY = b.INTKEY) AND (a.INTNUM IS NULL)) OR (a.INTNUM = 11)