HSA is still stored in IT0169, not IT0167. What I was trying to say was SAP processes HSA plan in IT0169 when payroll is run, it's smart enough to check year-to-date using the proper HSA limit (EE only or EE+) and automatically stop deduction when reached the limit based on health coverage in IT0167.
An ee covering him/herself in high deductible plan can still key HSA amount up to HSA limit for EE+ (unless you implement user-exit to check); however, payroll will stop when the limit for EE only is reached.