purchase currency change problem..

purchase currency change problem..

Hi,
I have problem whit default currency cahnge. for example I made a new PO with $ currency and after that I want to make anaother PO whit € currency and I'm chaning the default currency whit €. After than I look the PO which I made whit $ currency it was changed whit € currency too. this is big problem for us. I want to not changing the old PO currency when I change the default currency. Please help.

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