How to customize Report in oracle applications?

Here I have a requirement in "India Purchase Order Print Report (Standard)" check below sample output

In above output PO Date is there but that is a po creation date
so our requirement is in place of that display PO Approved Date.

Solution
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First download the report from server and open it through Report builder.

here my rdf name is XX_INDIA_STD_PO_PRINT.rdf

In Query they took PO Date
So I replaced that with Approved_Date. Then save it and go to server rename the old rdf with todays date in server and move our rdf to server.

Now it will display the approved date. So that simple.

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