Solution : https://service.sap.com/sap/support/notes/638129 (SAP Service marketplace login required)
Key words :
withholding information w-4/w-5, prerequisites sap introduced functionality, claiming tax exempt status, functionality prevented users, tax exempt indicator, user group basis, employees improperly changed, exempt status, exempt indicator, symptom user
Related Notes :
| 652743 | IT0210: Erroneous Entry/Display Only Fields on Infotype |
| 619163 | ITY: Minor enhancements in U.S. Tax infotype handling |
| 521204 | Q&A: Master Note for U.S. Master Data |