vacuum inside the transaction

Hello !

I just find out that if i try to use VACUUM inside the transaction
block, than it's fail (VACUUM cannot run inside a transaction block).
Ok, I'll vacuum after transaction, but why commit proceed without errors,
so I can think that my update committed :

isbs=# begin;
BEGIN
isbs=# update priceValues set withtax=false;
UPDATE 4976
isbs=# vacuum priceValues;
ERROR: VACUUM cannot run inside a transaction block
isbs=# end;
COMMIT
isbs=# select distinct withtax from priceValues;
withtax
---------

(1 row)
isbs=# select version();
version
---------------------------------------------------------------------
PostgreSQL 7.4.1 on i386-unknown-freebsd4.7, compiled by GCC 2.95.4
(1 row)

I think if commit not really commit a transaction, it should
return error code. Returning 'commit ok' make some confuse ...

--
best regards,
Ruslan A Dautkhanov rusland(at)scn(dot)ru