DATA: ls_domain LIKE LINE OF gt_domains.

LOOP AT gt_domains INTO ls_domain
   WHERE bukrs = source_fields-/bic/hrc_bukrs
     AND begda LE source_fields-/bic/lsa_ldate
     AND endda GE source_fields-/bic/lsa_ldate.

   result = ls_domain-domai.
   EXIT.
ENDLOOP.