Query to find Requisition header info

set lines 150
set pages 150

execute fnd_client_info.set_org_context('204');

col Description form a40
col Req_type form a26
col type_lookup_code form a16
col PREPARER form a30
col APPROVER form a30
col NOTE_TO_APPROVER form a40

SELECT prh.segment1 Requisition
, psp.manual_req_num_type req_num_type
, ppf.full_name Preparer
, prh.creation_date Creation_Date
, prh.type_lookup_code
, ppf1.full_name Approver
, t.type_name Req_type
, prh.description Description
, pah.note Note_To_Approver
, prh.requisition_header_id Req_header
FROM po_requisition_headers prh
, per_people_f ppf1
, per_people_f ppf
, po_action_history pah
, po_system_parameters psp
, PO_DOCUMENT_TYPES_ALL_TL T
, PO_DOCUMENT_TYPES_ALL_B B
WHERE prh.REQUISITION_HEADER_ID=11675
and NVL(PRH.contractor_requisition_flag, 'N') <> 'Y'
AND prh.preparer_id = ppf.person_id
AND nvl(ppf.business_group_id, 0) = (select nvl(max(fsp.business_group_id), 0)
from financials_system_parameters fsp)
AND nvl(pah.action_code,'SUBMIT') in ('SUBMIT', 'FORWARD', 'REJECT', 'APPROVE',
'APPROVE AND RESERVE', 'RESERVE', 'ACCEPT','RETURN')
--AND prh.segment1 = P_req_num_from
AND EXISTS (SELECT null
FROM po_requisition_lines prl
WHERE prl.requisition_header_id = prh.requisition_header_id
AND nvl(prl.modified_by_agent_flag,'N') = 'N'
AND nvl(prl.closed_code,'OPEN') != 'FINALLY CLOSED')
AND pah.object_id = prh.requisition_header_id
AND pah.employee_id = ppf1.person_id
AND pah.object_type_code = 'REQUISITION'
AND pah.object_sub_type_code = prh.type_lookup_code
AND pah.sequence_num =
(SELECT max(sequence_num)
FROM po_action_history pah
WHERE pah.object_id = prh.requisition_header_id
AND pah.object_type_code = 'REQUISITION'
AND pah.object_sub_type_code = prh.type_lookup_code)
and B.DOCUMENT_TYPE_CODE = T.DOCUMENT_TYPE_CODE
AND B.DOCUMENT_SUBTYPE = T.DOCUMENT_SUBTYPE
AND b.document_type_code = 'REQUISITION'
AND b.document_subtype = prh.type_lookup_code
AND NVL(B.ORG_ID, -99) = NVL(T.ORG_ID, -99)
AND NVL(B.ORG_ID,NVL(TO_NUMBER(DECODE(SUBSTRB(USERENV('CLIENT_INFO'),1 ,1),' ',
NULL,SUBSTRB(USERENV('CLIENT_INFO'),1,10))),-99))
= NVL(TO_NUMBER(DECODE(SUBSTRB(USERENV('CLIENT_INFO'),1,1),' ', NULL,
SUBSTRB(USERENV('CLIENT_INFO'),1,10))),-99)
AND T.LANGUAGE = USERENV('LANG');