What happens to open purchase orders after an ECO?

After an engineering change, affected purchase orders may be cancelled, reduced, redirected, consumed before cutover, renegotiated, or accepted as loss. The correct response depends on the product need, supplier terms, timing, and available alternate demand.

Identify affected PO lines at the part level

Begin with the removed, replaced, or quantity-changed parts in the revised BOM. Match those identities to open PO lines, including supplier-specific part numbers where engineering and purchasing use different identifiers.

Do not treat “open” as “cancellable”

An open quantity only describes transaction status. Cancellation eligibility depends on supplier terms, NCNR conditions, production progress, notice periods, restocking costs, and the supplier’s authoritative response.

Evaluate the six practical dispositions

1. Cancel: remove the remaining commitment with written supplier acceptance.
2. Reduce: retain only the quantity still needed.
3. Redirect: associate the material with credible alternate demand.
4. Consume: delay effectivity while old-revision demand is completed.
5. Negotiate: seek credit, return rights, or another commercial settlement.
6. Accept or write off: preserve the approved loss when no better option remains.

Keep uncertainty visible

If cancellation terms or a supplier response are missing, the financial effect is unresolved or estimated—not known. Surfacing that gap gives procurement a specific next action and prevents false confidence during approval.

Recalculate when evidence changes

Supplier responses, revised quantities, alternate demand, and effectivity decisions can change the financial position. Preserve each material update in the decision history so the final outcome remains traceable.

Use the free ECO cost calculator to screen aggregate inventory, WIP, and open-PO exposure, or try the interactive open-PO exposure decision lab using fictional data.