IDR line creation - line values

Summary:

What is the source of data the IDR line gets populated from: the PO or the invoice print?

Content (required):

How does IDR populate the line on the IDR matched invoice, does it populate it from the invoice print or the PO line? Our expectation is that as soon as the invoice is matched to the PO, the line information (ie. description, project number, requester, project task etc) get defaulted from the PO and not from the print.

Thanks

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