Hi,
Declaring Range is Obsolete,
Try This.
TYPES:rng_typ TYPE RANGE OF sfield.
DATA: rng_tbl TYPE rng_typ,
wa_rng TYPE LINE OF rng_typ.
LOOP AT itab INTO wa. "in your case ztable
wa_rng-sing-sign = 'I'.
wa_rng-option = 'EQ'.
wa_rng-low = wa-sfield.
APPEND wa_rng TO rng_tbl.
ENDLOOP.
Thanks