Tax Rules are not working as expected

Good day,

We have a requirement to default the tax rate from the item if no rate on the item level, we default the rate from the supplier address and then the supplier level,

but this default is not working as expected when we create a PO from PR.

So as a work around we created a tax rate rule based on the Product Based Fiscal Classification and this rule is working as expected, but when we defined a party fiscal classification rate rule as a priority 2 this rule is not working as expected,

how we can make these rules work together in the same order, or how we can meet this business requirements if possible?