Wrong "ORDER BY" on a numeric value result

Hello guys,

I have following sorting problem and need your help. When executing this SELECT statement:

"SELECT                  d.id,                  d.name,                d.description,         ts.name,
d.opentimestamp,      d.initialvalue,        d.plmoney,             d.performance,         d.performancepa,
d.currentopenmoney,   d.investedmoney,       d.investedpercent,     d.cashmoney,           d.realizedwinmoney,
d.realizedlossmoney,  d.currenttotalvalue,   d.depotriskpercent,         d.taxesratepercent,    d.taxallowance,
d.paidtaxes,          d.paidfees             FROM c_depots d INNER JOIN c_tradingsystems ts ON d.tradingsystem_id=ts.id
INNERJOIN cx_users_depots cx ON cx.id_depots=d.id INNER JOIN c_users u ON cx.id_users=u.id WHERE u.login='xxxx' ORDER
BYUPPER(CAST (d.currenttotalvalue AS numeric) ) DESC" 

the resulting ordering is wrong:
(d.currenttotalvalue)
99999999999,99
9999999999,99
999999999,99
99999,99
100947,51
100251,14
100100
10000000000
10000000000
100000

I would expect:

99999999999,99
9999999999,99
10000000000
10000000000
999999999,99
99999,99
100947,51
100251,14
100100
100000

The column currenttotalvalue has a numeric type with a length of 14 and 2 digits for percision. The initial SELECT
didn'tused the CAST, but the result was also wrong. 

I'm (still) using the postgres version 8.2.

Thanks for your support.