PO Tax Error for tax code in different currency.

12.1.3

Hi all

I created a Tax code in currecy USD. When creating Purchase Order in currency EUR, the approver got this message.

"Error: Tax Calculation: The system Cannot find tax rate for tax regime: UM Tax, Tax : GCT 10, Tax status: STANDARD, Tax Rate code: GCT 10 and Tax Jurisdiction code     : Null. Please contact Tax Manager "

I then went ahead and enter an invoice manually in currency EUR and the tax was calculate successfully.

So why are they getting this error when creating the PO.