[SQLObject] multiple ForeignKey

[Dave P. <dpo...@te...>]

I have a table named "string" where I have a bunch of strings in various
languages that I use to fillout templates. In a second table named
"automatic_payment_type" I have 2 columns named 'name' and 'bill_msg'
which should both be foreign keys to the 'string' table.  Here's my code
for this:

class String(SQLObject):
  _connection = __connection__
  name = StringCol(length=20)
  en = StringCol()
  fr = StringCol()

class Automatic_payment_type(SQLObject):
  _connection = __connection__
  name = ForeignKey('String')
  bill_msg = ForeignKey('String')


If I change 'bill_msg' to 'bill_msg_id = IntCol()' everything works, but
if I leave it as it is in this example, I'm getting the following error:

ValueError: Unknown SQL builtin type: <class
'SQLObject.SQLObject.MetaSQLObject'> for <class 'plugins.tables.String'>

Is there any clean way to do this?
-- 
Dave Poirier
Technology Integrator - Telecom Options Inc.
phone: +1.204.233.6100 ext: 228
cell: +1.204.997.6253
fax: +1.204.257.2106