I'm getting a parsing error when trying to port a datawindow to our Web API using the C# Model Generator.  The database is Oracle and the error is  Error: ORA-00952: missing GROUP keyword.  Below is the select statement being used.  It seems like the model generator does not like the Oracle LISTAGG function.  Is there a workaround or fix for this?  The datawindow previews fine in PB.

Thanks, Tom

SELECT x_partial.item_number as line_item,
(SELECT LISTAGG(rtrim(obs_code_id), '/') WITHIN GROUP (ORDER BY obs_code_id)
FROM l1_partial_codes WHERE partial_id = x_partial.partial_id) as hold
FROM
l1_claim_item,
x_partial
WHERE
l1_claim_item.claim_id = :claim_id AND
x_partial.partial_id = l1_claim_item.partial_id ;