An AP invoice approval workflow drawn on paper looks fast. Measured, it is minutes of work spread across days of waiting, and the waiting is dominated by approvers who are travelling, in meetings or on leave. That makes absence the thing to design around, and it is not usually what approval workflow design concentrates on.
Route to a person first time
By cost centre and value, to a named individual rather than a group. Group queues produce items everybody sees and nobody actions, and the effect is worst on the exceptions where the work is. Where a group is genuinely right, assign an owner anyway and allow reassignment, because an item with a name against it moves.
Cover absence without being asked
Delegation triggered by declared leave, plus a fallback after a fixed period of inactivity regardless. Manual delegation is forgotten exactly when it matters, because unplanned absence is unplanned. This single behaviour removes most of the long tail, and the long tail is what suppliers experience and remember.
Escalate rather than remind
A reminder repeating into the same silent inbox produces more silence. Escalation to a named alternative after a defined period is what makes elapsed time predictable enough to promise a supplier a date. Set the period by working backwards from your payment terms rather than accepting whatever the default was.
Questions people ask about ap invoice approval workflow
Does this weaken the control?
No. The same people approve the same things; the item simply reaches somebody who can decide instead of waiting on somebody who cannot.
How do we choose the escalation period?
From your terms. On thirty-day terms, an invoice waiting a week has already used a quarter of the available time.
What if the escalation target is also away?
Chain it to a default owner. Escalating into another empty queue is not escalation.