Approval routing by supplier country when changing supplier

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Good evening,
I would like to know which approval attribute is the most appropriate to use when a change in the supplier should trigger a rerouting of the approval rule based on the supplier’s country.

The country-related attributes I’m currently using don’t seem to work properly or require the supplier to have tax information entered, which is not always the case.

Since users don’t always complete the tax-related fields, I would like to know what other attribute options I have to achieve country-based routing.

Below are the approval attributes I’m currently using: