Tax Withholding Card for Non-Payroll Extensions
You can still use the Tax Withholding card to maintain your employee federal and state tax withholding info when you are using the non-Payroll extensions.
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                Human Resources or None 
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                Payroll Interface 
For these extensions, Oracle provides GBG|Loqate as the default geography provider for address validation. You can use choose a different geography provider, but you must ensure they use a 2-character State-level Geocode equivalent to Vertex's.
Run the Maintain US Geography flow at the time of your implementation. This process:
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                Enables the Tax Withholding Card at the state level. 
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                Adds the 2-digit state-level Geocode.