SQL query is taking very long time using in EBS - performance

Question

I have select query below and it is taking long time for only one org_id=83 only don't know why?
can you please help me on this? Please let me know if you need more details on this?
I am using Oracle 11.2.1 version.
SELECT a.customer_trx_id CUSTOMER_TRX_ID,
a.trx_number TRX_NUMBER,
Nvl(TL.sequence_num, 1)
TERM_SEQUENCE_NUMBER,
types.TYPE TRX_TYPE,
l_types.meaning TRX_TYPE_NAME,
TYPES.accounting_affect_flag
OPEN_RECEIVABLE_FLAG,
a.trx_date TRX_DATE,
ship_to_customer_id
SHIP_TO_CUSTOMER_ID,
ship_to_contact_id SHIP_TO_CONTACT_ID
,
remit_to_address_id
REMIT_TO_ADDRESS_ID,
A.primary_salesrep_id
PRIMARY_SALESREP_ID,
B.account_number CUSTOMER_NUMBER,
A.internal_notes INTERNAL_NOTES,
A.batch_source_id BATCH_SOURCE_ID,
A.comments TRX_COMMENTS,
previous_customer_trx_id
PREVIOUS_CUSTOMER_TRX_ID,
ship_to_site_use_id
SHIP_TO_SITE_USE_ID,
Nvl(printing_count, 0) PRINTING_COUNT,
printing_original_date
PRINTING_ORIGINAL_DATE,
printing_last_printed
PRINTING_LAST_PRINTED,
printing_pending PRINTING_PENDING,
last_printed_sequence_num
LAST_PRINTED_SEQUENCE_NUMBER,
start_date_commitment
START_DATE_COMMITMENT,
end_date_commitment
END_DATE_COMMITMENT,
initial_customer_trx_id
INITIAL_CUSTOMER_TRX_ID,
A.invoice_currency_code
INVOICE_CURRENCY_CODE,
A.term_id TERM_ID,
A.ship_date_actual SHIP_DATE_ACTUAL,
A.ship_via SHIP_VIA,
A.waybill_number WAYBILL_NUMBER,
A.purchase_order
PURCHASE_ORDER_NUMBER,
A.purchase_order_revision
PURCHASE_ORDER_REVISION,
A.purchase_order_date
PURCHASE_ORDER_DATE,
P.due_date
TERM_DUE_DATE_FROM_PS,
Nvl(TL.relative_amount, 100) * ( 100 / Nvl(T.base_amount, 100) )
TERM_RELATIVE_AMOUNT,
T.name TERM_NAME,
A.bill_to_customer_id
BILL_TO_CUSTOMER_ID,
A.bill_to_contact_id BILL_TO_CONTACT_ID
,
A.bill_to_site_use_id
BILL_TO_SITE_USE_ID,
U_BILL.location BILL_TO_LOCATION,
Nvl(A_BILL.translated_customer_name, PARTY.party_name) BILL_CUST_NAME,
Rtrim(Rpad(LOC.address1, 40)) BILL_ADDRESS1,
Rtrim(Rpad(LOC.address2, 40)) BILL_ADDRESS2,
Rtrim(Rpad(LOC.address3, 40)) BILL_ADDRESS3,
Rtrim(Rpad(LOC.address4, 40)) BILL_ADDRESS4,
LOC.city BILL_CITY,
Nvl(LOC.state, LOC.province) BILL_STATE,
LOC.postal_code BILL_POSTAL_CODE,
LOC.country BILL_COUNTRY,
U_BILL.tax_reference
BILL_SITE_TAX_REFERENCE,
PARTY.tax_reference
BILL_CUST_TAX_REFERENCE,
Nvl(amount_line_items_original, To_number(NULL)) TRX_LINE_AMOUNT,
Nvl(tax_original, To_number(NULL)) TRX_TAX_AMOUNT,
Nvl(freight_original, To_number(NULL)) TRX_FREIGHT_AMOUNT
,
p.amount_due_original
TRX_ALL_AMOUNT,
A.trx_number ORDER_BY,
LOC.address1 BILL_TO_ADDRESS1,
LOC.address2 BILL_TO_ADDRESS2,
LOC.address3 BILL_TO_ADDRESS3,
LOC.address4 BILL_TO_ADDRESS4,
LOC.state BILL_TO_STATE,
LOC.province BILL_TO_PROVINCE
FROM ar_adjustments COM_ADJ,
ar_payment_schedules P,
ra_cust_trx_line_gl_dist REC,
ra_customer_trx A,
hz_cust_accounts B,
ra_terms T,
ra_terms_lines TL,
ra_cust_trx_types TYPES,
ar_lookups L_TYPES,
hz_parties PARTY,
hz_cust_acct_sites A_BILL,
hz_party_sites PARTY_SITE,
hz_locations LOC,
hz_cust_site_uses U_BILL
WHERE A.bill_to_customer_id = B.cust_account_id
AND REC.customer_trx_id = A.customer_trx_id
AND REC.latest_rec_flag = 'Y'
AND REC.account_class = 'REC'
AND P.payment_schedule_id + Decode(P.class, 'INV', 0, '') = COM_ADJ.payment_schedule_id(+)
AND COM_ADJ.subsequent_trx_id IS NULL
AND 'C' = COM_ADJ.adjustment_type(+)
AND A.complete_flag = 'Y'
AND A.cust_trx_type_id = TYPES.cust_trx_type_id
AND L_TYPES.lookup_type = 'INV/CM/ADJ'
AND A.printing_option IN ( 'PRI', 'REP' )
AND L_TYPES.lookup_code = Decode(TYPES.TYPE, 'DEP', 'INV',
TYPES.TYPE)
AND Nvl(P.terms_sequence_number, Nvl(TL.sequence_num, 0)) =
Nvl(TL.sequence_num, Nvl(p.terms_sequence_number, 0))
AND Decode(P.payment_schedule_id, '', 0,
Nvl(T.printing_lead_days, 0)) = 0
AND A.bill_to_site_use_id = U_BILL.site_use_id
AND U_BILL.cust_acct_site_id = A_BILL.cust_acct_site_id
AND A_BILL.party_site_id = party_site.party_site_id
AND B.party_id = PARTY.party_id
AND loc.location_id = party_site.location_id
AND Nvl(LOC.LANGUAGE, 'US') = 'US'
AND Nvl(P.amount_due_remaining, 0) <> 0
AND A.term_id = TL.term_id(+)
AND A.term_id = T.term_id(+)
AND A.customer_trx_id = P.customer_trx_id(+)
AND A.printing_pending = 'Y'
AND Nvl(TL.sequence_num, 1) > Nvl(A.last_printed_sequence_num, 0)
AND Nvl(LOC.LANGUAGE, 'US') = 'US'
AND NOT EXISTS
(SELECT 'X'
FROM ece_tp_details ETD,
ece_tp_headers ETH
WHERE ETH.tp_header_id = A_BILL.tp_header_id
AND ETD.tp_header_id = ETH.tp_header_id
AND ETD.edi_flag = 'Y'
AND ETD.document_id = 'INO'
AND ETD.document_type = Decode (TYPES.TYPE, 'CM',Decode(A.previous_customer_trx_id, NULL, 'OACM', 'CM'), TYPES.TYPE))
UNION
SELECT a.customer_trx_id,
a.trx_number,
Nvl(P.terms_sequence_number, 1),
types.TYPE,
l_types.meaning,
TYPES.accounting_affect_flag,
a.trx_date,
A.ship_to_customer_id,
A.ship_to_contact_id,
A.remit_to_address_id,
A.primary_salesrep_id,
B.account_number,
A.internal_notes,
A.batch_source_id,
A.comments,
previous_customer_trx_id,
ship_to_site_use_id,
Nvl(printing_count, 0),
printing_original_date,
printing_last_printed,
printing_pending,
last_printed_sequence_num,
start_date_commitment,
end_date_commitment,
initial_customer_trx_id,
A.invoice_currency_code,
A.term_id,
A.ship_date_actual,
A.ship_via,
A.waybill_number,
A.purchase_order,
A.purchase_order_revision,
A.purchase_order_date,
P.due_date,
Nvl(TL.relative_amount, 100) * ( 100 / Nvl(T.base_amount, 100) ),
T.name,
A.bill_to_customer_id,
A.bill_to_contact_id,
A.bill_to_site_use_id,
U_BILL.location BILL_TO_LOCATION,
Nvl(A_BILL.translated_customer_name, PARTY.party_name) BILL_CUST_NAME,
Rtrim(Rpad(LOC.address1, 40)),
Rtrim(Rpad(LOC.address2, 40)),
Rtrim(Rpad(LOC.address3, 40)),
Rtrim(Rpad(LOC.address4, 40)),
LOC.city,
Nvl(LOC.state, LOC.province),
LOC.postal_code,
LOC.country,
U_BILL.tax_reference,
PARTY.tax_reference,
Nvl(amount_line_items_original, To_number(NULL)),
Nvl(tax_original, To_number(NULL)),
Nvl(freight_original, To_number(NULL)),
p.amount_due_original,
A.trx_number,
LOC.address1,
LOC.address2,
LOC.address3,
LOC.address4,
LOC.state,
LOC.province
FROM ra_terms_lines TL,
ra_cust_trx_types TYPES,
ar_lookups L_TYPES,
hz_cust_accounts B,
hz_parties PARTY,
hz_cust_site_uses U_BILL,
hz_cust_acct_sites A_BILL,
hz_party_sites PARTY_SITE,
hz_locations LOC,
ar_adjustments COM_ADJ,
ra_customer_trx A,
ar_payment_schedules P,
ra_terms T
WHERE A.bill_to_customer_id = B.cust_account_id
AND P.payment_schedule_id
+ Decode(P.class, 'INV', 0, '') = COM_ADJ.payment_schedule_id(+)
AND COM_ADJ.subsequent_trx_id IS NULL
AND 'C' = COM_ADJ.adjustment_type(+)
AND A.complete_flag = 'Y'
AND A.customer_trx_id = P.customer_trx_id
AND A.cust_trx_type_id = TYPES.cust_trx_type_id
AND L_TYPES.lookup_type = 'INV/CM/ADJ'
AND A.printing_option IN ( 'PRI', 'REP' )
AND L_TYPES.lookup_code = Decode(TYPES.TYPE, 'DEP', 'INV',TYPES.TYPE)
AND Nvl(T.printing_lead_days, 0) > 0
AND A.bill_to_site_use_id = U_BILL.site_use_id
AND U_BILL.cust_acct_site_id = A_BILL.cust_acct_site_id
AND A_BILL.party_site_id = PARTY_SITE.party_site_id
AND B.party_id = PARTY.party_id
AND LOC.location_id = PARTY_SITE.location_id
AND Nvl(LOC.LANGUAGE, 'US') = 'US'
AND Nvl(P.terms_sequence_number, TL.sequence_num) = TL.sequence_num
AND Nvl(P.amount_due_remaining, 0) <> 0
AND T.term_id = P.term_id
AND TL.term_id(+) = T.term_id
AND A.printing_pending = 'Y'
AND P.terms_sequence_number > Nvl(A.last_printed_sequence_num, 0)
AND Nvl(LOC.LANGUAGE, 'US') = 'US'
AND NOT EXISTS
(SELECT 'X'
FROM ece_tp_details ETD,
ece_tp_headers ETH
WHERE ETH.tp_header_id = A_BILL.tp_header_id
AND ETD.tp_header_id = ETH.tp_header_id
AND ETD.edi_flag = 'Y'
AND ETD.document_id = 'INO'
AND ETD.document_type = Decode (TYPES.TYPE, 'CM',Decode(A.previous_customer_trx_id,NULL, 'OACM','CM'),TYPES.TYPE))
Thank you!