Regarding Adding group currecny in open purchase order

Hi SAP Guru

I am trying to understand concept of group currency.

We added parallel currency in middle of Fiscal year 2015. at that time we had many open purchase orders was available. now because of that situation every time Finance team needs to do adjustment entries every period. Is there any way that I can add group currency in all open invoices. I tried to understand OSS note 39919 for this issue.

I need help

here is an example please check screen shot

Above mention is an open purchase order. now if I want to add our group currency (30). our company code currency is USD and our group currency is also USD. Please can any body help me for adding group currency in open purchase order. I am trying to add group currency in open purchase order.

Thank you

Mona