7.1beta4 bug creating a certain table

I cannot create a certain table in 7.1beta4. With 7.0.2 there was not any
problem.

------------------------------------------------------------------------------
CREATE TABLE pakolas_cikktetel (
pakolas int4 not null,
cikk int4 not null,
minoseg int4 not null,
sorszam int4 check (sorszam > 0),
helyrol int4,
helyre int4,
mennyi numeric(14,4) not null ,
lezarva bool default 'f',
primary key (pakolas, cikk, minoseg, sorszam),
unique (pakolas, cikk, minoseg, helyrol, helyre));

CREATE TABLE keszlet_bevetel (
keszletnovekedes int4 not null primary key,
pakolas int4 not null,
cikk int4 not null,
minoseg int4 NOT NULL,
foreign key (pakolas, cikk, minoseg)
references pakolas_cikktetel(pakolas, cikk, minoseg));
------------------------------------------------------------------------------

Here I get the following error:

ERROR: UNIQUE constraint matching given keys for referenced table
"pakolas_cikktetel" not found

(The second table will not be created.)

By the way, is it possible generating patches between beta releases and
putting on the ftp server?

TIA, Zoltan