R12 APXINWKB Error Out 'Payables could not calculate tax due to:An unexpected error has occurred'

Applies to:

Oracle Payables - Version: 12.0.0
This problem can occur on any platform.
APXINWKB.fmb

Symptoms

On 12.0 in Production:
There's a problem with viewing and calculating Taxes on R12.
After creating a Tax Regime, Taxes, Tax Statuses, Tax Jurisdictions, Tax Rates and Tax Rules, and while trying to callculate tax the following error message is displayed

ERROR

"Payables could not calculate tax due to:An unexpected error has occurred"

Cause

The issue is caused by the following setup:
There is no defined Rule Set and condition Set

By defining the Rule Set and condition Set the issue will be resolved

Solution

To implement the solution, please execute the following steps:

1. Go into the responsibility: Tax Managers

2. Navigate to Tax Configuration>Tax Rules>Rule Conditions >Rule Results> Rule Order> Rule Sets

3.Define Rule set and Factor Set

4.Go to Tax>Enable Make Tax Available for Transactions

5.Apply and Make sure that no errors are displayed

6. Retest the issue.

5. Migrate the solution as appropriate to other environments.