If it helps, here is my actual, complete SQL statement that gives me the error:
SELECT
P.BusinessUnit,
(NumWon + NumLost + NumPending) as NumQuoted,
(ValueWon + ValueLost + ValuePending) as ValueQuoted,
NumWon,
ValueWon,
NumLost,
ValueLost,
NumPending,
ValuePending,
(case when ((NumWon +...