Problem Script SQL

[Eric S�nchez Tamayo via users]

Hi.

In an SQL Script step, I'm performing this Merge that works perfectly fine with 
DBeaver:

MERGE INTO DES_DV.dv_maes_almacen AS a
USING (
  SELECT DISTINCT
                Cod_Almacen as id_almacen_nk,
                Almacen as almacen
                FROM des_ds.ds_almacen
) b
ON (a.id_almacen_nk = b.id_almacen_nk)
WHEN MATCHED
  AND (
    a.almacen <> b.almacen
    AND a.flag <> 'new'
    )
THEN
  UPDATE SET
                a.almacen = b.almacen,
       a.flag = 'changed',
                a.fecha_etl_modificacion = GETDATE()
WHEN NOT MATCHED THEN
  INSERT (
                id_almacen_nk,
                almacen,
                flag
  )
  VALUES (
                b.id_almacen_nk,
                b.almacen,
                'new'
  );

However, when I put it in the SQL Script step, I encounter the following error: 
SQL Error [10713] [S0001]: A MERGE statement must end with a semicolon (;). 
What problem could be happening?

Best regards.