while migrating oracle to PostgreSQL getting the error “ ERROR: syntax error at or near ”@“ LINE 16: from csm016@fbi a, csm013@fbi b”

Question

CREATE OR REPLACE FUNCTION ecs_pkg.get_busi_type ( acct_no_in text, cont_no_in text, p_message OUT text ) AS $body$
DECLARE

    V_SEQ_NO varchar(6);
    v_date_time