Global Absence Disbursement Transaction is always auto-approved despite having an approval workflow

As an HR admin, when I submit an absence disbursement request on behalf of other employees, the transaction is automatically approved, even though an approval rule is configured.

The workflow condition is defined as:

if (getRequestorInformationByUserNameResponse.result.businessUnit == "Papua New Guinea Business Unit")

Then:
→ Approval should be routed to the employee’s line manager.