Solution : https://service.sap.com/sap/support/notes/730516 (SAP Service marketplace login required)
Key words : 
bsi tax update bulletin 268, prerequisites legal change solution, er workers' comp tax, employer workers' compensation, employee workers' compensation, payroll function unmex, function unmex, terms unmex, date-sensitive, mexico reason
Related Notes : 
       
| 1000842 | TAX: Gross-up incorrect for NM Work. Comp. Employees. | 
| 751533 | TAX: Move New Mexico calculation from UNMEX to USTAX |