set a combination of columns of a table as unique

[jButtkus]

Is it possible in EA to set a combination of columns as unique?
So the generated ddl output will look like this:
----------------------------------------------------------
CREATE TABLE uniquetest
(
 a int4 ,
 b int4 ,
 c int4,
 CONSTRAINT uniquetest_pkey PRIMARY KEY (a, b),
 CONSTRAINT uniquetest_mandant_key UNIQUE (a, c)
)
----------------------------------------------------------
When i set the columns in EA separately as UNIQUE the
ddl script declares the columns separately as UNIQUE as well.

Any ideas?    

[thomaskilian]

This already works: Create an operation in the table and stereotype as <<unique>>. Then add the related columns. This will create the DDL as you wish.

[jButtkus]

Ah, this way it works...

Thanks alot!