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After we've found the needed approval tiers, the system will consult with Employees → Approval tier values to find all employees for given department (remember, it's coming from purchase request) and having application role Approver. All found approvers will be added to given purchase order approvers list arranged by their approval tier Upper limit ASC.

Approval by user in FINANCE role

User with role FINANCE can ultimately approve the PO or make any modifications in the approved PO. No matter if other have voted (or how), the vote of the FINANCE user will be ultimate and immediately transit the PO either to Approved or Rejected status.

This is implemented with the idea in mind that sometimes it is necessary to speed-up the approvement process (people might change the job, forget to do the approval or be on vacation). Also, it might be necessary to make corrections even in approved PO. For that reason a FINANCE user has the power to do this things.

As you may probably see here, it is generally not a good idea to have a user with FINANCE role in the list of approvers for the purchase order. This can logically compromise the approval workflow where everybody is expected to give his or her vote for the specific purchase request.