Purchase requisition currency does not default from supplier site

I am creating a Purchase requisition. The primary ledger or functional currency is USD. So currency at the requisition header is USD.

I enter item, select quantity and promise date and supplier/site defaults

The invoice currency at supplier site level is EUR. I expect after saving the requisition, the line currency code will default to EUR. But it remains null. The currency_code and currency_unit_price in po_requisition_lines_all is blank. The expectation is that currency_code should be EUR and currency_unit_price should be in EUR based on exchange rate defined with USD (functional currency)