Weird error message in SQL function call

Hi all.

I've got this error message while running an SQL function:

---- BEGIN
psql:filtb.sql:1029: ERROR: COMMIT is not allowed in a SQL function
CONTEXT: SQL function "f_relazione" during startup
funzione SQL "f_relazione" istruzione 1
---- END

Of course, I have no COMMIT command either in the function itself or
in any other function called by f_relazione().
In the syslog I see that this is labelled as error #0A000 "Feature not
supported".

Is there any hint?

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