need to insert control record one time in sql loader

I want to insert a record in a control table at the beginning of the load (with NEXTVAL seqno), then with the regular load will use CURRVAL.

Can I say something like "where rownum = 1" ? so it only happens once ?

APPEND INTO TABLE medpartd.etl_file_load_det
        when (rownum = 1) <-- something line this ??
        (
        etl_load_file_id "medpartd.etl_file_load_det.nextval",
        etl_file_nm constant 'MMR Load from CGI',
        etl_prcs_load_dt "sysdate"
        )
        INTO TABLE MEDPARTD.cgdp_stg_mthly_membshp_det
        (
        mthly_membshp_skey "medpartd.mor_rpt_det_seq.nextval",
        aud_insrt_id "user",
        aud_srce_sys_cd constant '194',
        aud_insrt_tmstp "localtimestamp",
        etl_load_file_id "medpartd.etl_file_load_det_seq.currval",
        MCO_CTRT_NBR  position (1:5) char,
        RUN_DT_OF_THE_FILE  position (6:13) char,
        PAYMT_DT  position (14:19) char,
        HIC_NBR  position (20:31) char,

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