Use an HRIS rather than extending enterprise accounting software when the missing capability is dependable employee information and administration. If HR cannot maintain reporting relationships, retrieve employment history, or control employee changes, the next improvement belongs on the HR side. A more capable ledger will not necessarily solve those problems.
Enterprise accounting remains responsible for financial work such as accounts, reconciliation, and reporting. The decision is usually which capability to add or improve, not whether to discard finance. A company can have sophisticated financial systems and still need a better place to manage the employee facts that feed them.