HI Jimmy:
I agree, even though this is a common issue, the cause can be hundreds of thousands. Naren made a good point, for specific scenario your screen shot on almost everything is needed, like pricing determination, pricing analysis, tax code record with account number, tax determination procedure definition.
last time when I had it issue it was due to the discrepancy between pricing procedure and tax procedure. for example tax determination assigned to the country found JR1 record. however, JR1 is not maintained in my pricing procedure. once I updated the pricing procedure, i was able to solve the problem.
This is gonna be fun, and headache as well 