I use a locate using a partial key against a query like the one below
using a TIBOQuery. Most of the time, I get a "Token unknown" error
listing _NAME as the problem. Here's what shows up in the Monitor Log:

INTERPRETE BUFFER = _NAME
ERRCODE = -1

Here's the SQL:

SELECT
Customer_ID,
Last_Name,
First_Name,
Cust_Active,
((Last_Name||', ')||First_Name) as Name
FROM Custinfo C
where
Cust_Active = :Status

I'm running against Firebird 1.5. What could be wrong?