Intercompany OK order and Voucher Currency issue

Hi,

How system decides currency on OK intercompany purchase order.

We have one issue where normally the voucher for Intercompany OK order is created in GBP currency but for one batch it has created in EUR currency. I checked the corresponding OK order. There is no EUR currency on order. But still voucher is created in EUR.

i checked P04012 for supplier of that OK order. The currency code is EUR. If it is EUR then how does other vouchers are coming in GBP currency.

Can you please help on this.