Iam a beginner just trying to learn this IB Objects. I have been
trying to learn this about four hours already and I encounter this
problem where I dont know what to do

Iam getting a message like this "invalid custom DML column reference:
RDB$DB_KEY." what does this mean? I have a sql statement like this in
the query1.sql

select d."invdate", m.*, d2."port", d2."etd"
from "invoicedetails" m inner join "invoice" d on m."invid" =
d."invid"
left join "packing" d2 on m."packingid" =
d2."packingid"


Please help me with this one. It works fine in IBX.