Customer want to post invoices in different currency code in same PO. But system don't let change the currency code after first Invoice is posted. For example; They buy an Item. And It have an assembly service. This is an other item within service type in PO. First Invoice comes in Euro. The service invoice comes as Turkish Lira. Customer don't post these invoices in same PO. They have to open new PO for the service invoice. An other side of this case, the payments are also different currency codes like invoices euro and turkish Lira. And customer wants to follow all these things in one PO.