jg_zz_vat_rep_status join with transactions table

I need to join the tables jg_zz_vat_rep_status or jg_zz_vat_rep_entities with AR transactions tables. the query is:

select CASE
    when count(DEFAULT_SET_CODE) > 0
      then 'NON VALIDATO'
    else 'VALIDATO'
  END STATO
from (select distinct fnbu.DEFAULT_SET_CODE
  ,fnbu.bu_id
  ,COUNT(rcta.customer_trx_id) AS fatt_sede
from FUN_NAMES_BUSINESS_UNITS_V fnbu
  ,RA_CUSTOMER_TRX_ALL rcta
  ,ra_cust_trx_line_gl_dist_all rctd
  ,FND_DOCUMENT_SEQUENCES fds
  ,jg_zz_vat_rep_status st
  ,jg_zz_vat_rep_entities ent
where fnbu.status = 'A'
  and fnbu.default_set_code not like '%COMMON%'