Using ConText contains() in subquery

In the code below, the contains() function call fails with an "invalid column" error message. But if you comment out the first line and run the select statement as a top-level query, it works perfectly. We're building the (much more complicated) select statement dynamically, so redoing this as a stored procedure would be awkward. Any ideas?

insert into search_results (catalog_entry_id, score) SELECT catalog_entry.catalog_entry_id,
((score(10) * 5) + (score(30) * 2) + (score(20) * 1)) FROM catalog_entry
WHERE

(  contains(catalog_entry.title,             'pigskin', 10) > 0
or contains(catalog_entry.short_description, 'pigskin', 30) > 0
or contains(catalog_entry.long_description,  'pigskin', 20) > 0

  Marc Schabb
  Foundry
  410-223-2760 x3016 Received on Sat Nov 13 1999 - 13:09:13 CST