Solution : https://service.sap.com/sap/support/notes/647553 (SAP Service marketplace login required)
Key words :
select function group ehu2, simplified state withholding information, standard federal w-4 form, state-relevant w-4 fields, state tax authority, method named adjust_before_output, method named validate_after_input, w-4 ess scenario, ess w-4 scenario, screen control section
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