MIRO without a tax code

Hi experts,

I want to enter supplier invoices in USA without TAX code.

Our company in USA does not work with TAX.

I setup a TAXUS procedure accordingly and so all the GL accounts master data in the US company.

I can do transactions without tax code in all the transactions including FB60. In MIRO I get an error message "Enter a tax code".

How can I setup the system so it will let me do it without tax code.

Thanks

Ofer