[SQL] Sequenties in pgSQL 7.3.x

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Hi I am using postgresql 7.3.x. I am upgrating a database PostgreSQL. The main problem is how to change field last value in sequencde which exists in database. I created script to read this field and then I'm drop the table, do modification and i'm must change this value to another value. But DBMS returns me message like that ERROR:  You can't change sequence relation seq_id_seq How to do this