PO without Requisition

select
prh.segment1 "PR NUM",
trunc(prh.creation_date) "CREATED ON",
trunc(prl.creation_date) "Line Creation Date" ,
prl.line_num "Seq #",
msi.segment1 "Item Num",
prl.item_description "Description",
prl.quantity "Qty",
trunc(prl.need_by_date) "Required By",
ppf1.full_name "REQUESTOR",
ppf2.agent_name "BUYER"
from
po.po_requisition_headers_all prh,
po.po_requisition_lines_all prl,
apps.per_people_f ppf1,
(select distinct agent_id,agent_name from apps.po_agents_v ) ppf2,
po.po_req_distributions_all prd,
inv.mtl_system_items_b msi,
po.po_line_locations_all pll,
po.po_lines_all pl,
po.po_headers_all ph
WHERE
prh.requisition_header_id = prl.requisition_header_id
and prl.requisition_line_id = prd.requisition_line_id
and ppf1.person_id = prh.preparer_id
and prh.creation_date between ppf1.effective_start_date and ppf1.effective_end_date
and ppf2.agent_id(+) = msi.buyer_id
and msi.inventory_item_id = prl.item_id
and msi.organization_id = prl.destination_organization_id
and pll.line_location_id(+) = prl.line_location_id
and pll.po_header_id = ph.po_header_id(+)
AND PLL.PO_LINE_ID = PL.PO_LINE_ID(+)
AND PRH.AUTHORIZATION_STATUS = 'APPROVED'
AND PLL.LINE_LOCATION_ID IS NULL
AND PRL.CLOSED_CODE IS NULL
AND NVL(PRL.CANCEL_FLAG,'N') <> 'Y'
ORDER BY 1,2