RETURN QUERY
                   WITH TRW AS (
                     INSERT INTO docs (doc_type_id,series_doc,number_doc,date_doc)
                     SELECT doc_type_id, NULLIF(series_doc,''), NULLIF(number_doc,''),date_doc
                       FROM docs_buf
                      WHERE doc_buf_id = p_id
                     RETURNING doc_id --INTO doc_id_return
                   )
               SELECT CAST(TRW.doc_id as INT4) INTO doc_id_return
               FROM TRW
               GROUP BY TRW.doc_id
;

           --    EXECUTE QUERY INTO doc_id_return;