[RC3] Error when creating budget lines

In Openerp V5 RC3
I've error message when creating Budget Lines in the budget form.

Traceback (most recent call last):
File "/openerp/openerp-server-5.0.0_rc3/bin/netsvc.py", line 421, in run
result_from_method = method(*msg[2:])
File "/openerp/openerp-server-5.0.0_rc3/bin/service/web_services.py", line 427, in execute
res = service.execute(db, uid, object, method, *args)
File "/openerp/openerp-server-5.0.0_rc3/bin/osv/osv.py", line 59, in wrapper
return f(self, dbname, *args, **kwargs)
File "/openerp/openerp-server-5.0.0_rc3/bin/osv/osv.py", line 120, in execute
res = pool.execute_cr(cr, uid, obj, method, *args, **kw)
File "/openerp/openerp-server-5.0.0_rc3/bin/osv/osv.py", line 112, in execute_cr
return getattr(object, method)(cr, uid, *args, **kw)
File "/openerp/openerp-server-5.0.0_rc3/bin/osv/orm.py", line 1846, in read
result = self._read_flat(cr, user, select, fields, context, load)
File "/openerp/openerp-server-5.0.0_rc3/bin/osv/orm.py", line 1948, in _read_flat
res2 = self._columns[f].get(cr, self, ids, f, user, context=context, values=res)
File "/openerp/openerp-server-5.0.0_rc3/bin/osv/fields.py", line 626, in get
res = self._fnct(obj, cr, user, ids, name, self._arg, context)
File "/openerp/openerp-server-5.0.0_rc3/bin/addons/account_budget/crossovered_budget.py", line 181, in _prac
res[line.id]=self._prac_amt(cr,uid,[line.id],context=context)[line.id]
File "/openerp/openerp-server-5.0.0_rc3/bin/addons/account_budget/crossovered_budget.py", line 171, in _prac_amt
cr.execute("select sum(amount) from account_analytic_line where account_id=%s and (date between to_date(%s,'yyyy-mm-dd') and to_date(%s,'yyyy-mm-dd')) and general_account_id in (%s)", (line.analytic_account_id.id,date_from,date_to,acc_ids))
File "/openerp/openerp-server-5.0.0_rc3/bin/sql_db.py", line 76, in wrapper
return f(self, *args, **kwargs)
File "/openerp/openerp-server-5.0.0_rc3/bin/sql_db.py", line 114, in execute
res = self._obj.execute(query, params)
DataError: ERREUR: syntaxe en entrée invalide pour l'entier : « 642,658 »

I don't know why it bring the integer 642,658 !!!