Need query for PO drill down to GL

Hi,

I am building a query for Gl drill down for the JE_SOURCES to PO,AP,WIP,Inventory,Cost Management

But getting duplicate values when adding the PO Number.

Not sure what is missed here. I tried with subquery for gettingPO number but anyhow getting duplicate values

SELECT DISTINCT

    gjl.effective_date,

    glcc.concatenated_segments   segments,

    gjl.period_name,

gjh.name                     journal_name,

    gjh.je_source                journal_source,

    gjh.je_category              journal_category,

        initcap(gjl.description) "JE line Description",

--pha.segment1,

   -- (select distinct po.segment1 from apps.po_headers_all po where po.po_header_id=poh.po_header_id and  po.po_header_id=pod.po_header_id) "Purchase Order Number",