>> I hope that explains it. Im sure there are others who could explain it
>> better than I.
>
> BTW, this is documented at the release notes

As an intermediate solution, one could set

RelaxedAliasChecking = 1

in firebird.conf to allow such queries, but the OP should really fix
this queries.


--
Best Regards,
Thomas Steinmaurer
LogManager Series - Logging/Auditing Suites supporting
InterBase, Firebird, Advantage Database, MS SQL Server and
NexusDB V2
Upscene Productions
http://www.upscene.com