Queries :: Access 2010 Query Won't Recognize Criteria From Form Text Box

I've been writing queries in the following format for years in Access 2003, but having recently transistioned to Access 2010, I've found the following sql doesn't work.transform

sum(s.value)
SELECT
s.sn, s.ln, s.pn, s.id, s.lat, s.point, s.supply_type, s.used, s.real, s.code, c.name
FROM
supply_points s
, codes c
WHERE
s.code = c.code
and s.id is not null
and s.code = 1075
and s.month >=[forms]![main]![gppstart ]
group by
s.sn, s.ln, s.pn, s.id, s.lat, s.point, s.supply_type, s.used, s.real, s.code, c.name
pivot
s.month

In Access 2010, this query returns the following error message:the Microsoft Access database does not recognize '[forms]![main]![gppstart]' as a valid field name or expression

Is this a common phenomena in Access 2010?