SQL & PL/SQL

Hi all, I have the following query

select a.incident_id,incident_number, d.source_object_id, a.incident_status_id, d.TASK_ID TASK_ID ,jta.task_id assign_task_id, d.source_object_type_code, a.owner_group_id, a.customer_id,jta.resource_type_code, jta.resource_id
FROM cs_incidents_all_b a, cs_incident_statuses_b b, Cs_Incident_Statuses_Tl c, jtf.jtf_tasks_b d, jtf_task_assignments jta, jtf_rs_groups_vl jrg
WHERE b.incident_status_id = c.incident_status_id
AND a.incident_status_id = b.incident_status_id
AND c.language = 'EL'
AND b.incident_status_id = 1
AND a.owner_group_id IN (SELECT * FROM TABLE(CAST(xxi_szf_discoverer.get_lov_group_id('ΣΥΖΕΥΞΙΣ-ΒΛΑΒΟΔΙΑΧΕΙΡΙΣΤΕΣ') AS xxi_group_id_tab)))
AND a.customer_id IN (SELECT * FROM TABLE(CAST(xxi_szf_discoverer.get_party_id('ΣΥΖΕΥΞΙΣ-ΒΛΑΒΟΔΙΑΧΕΙΡΙΣΤΕΣ','ΚΤΠ ΦΟΡΕΙΣ') AS xxi_party_id_tab)))
AND a.incident_id = d.source_object_id (+)
AND d.source_object_id IS NULL
AND d.task_id = jta.task_id (+)
AND jta.resource_type_code IS NULL
AND jrg.group_id = jta.resource_id (+)
order by incident_number

As you see I need to find a workaround to replace the second outer join, otherwise I get the error : ORA-01417: a table may be outer joined to at most one other table

Any suggestion will be appreciated...

Alex