The supplier says it is equivalent: approving product substitutions properly

The original item is delayed. The supplier offers a replacement at the same price and describes it as equivalent. That may solve the problem, but “equivalent” has to mean something more precise than a similar photograph and a reassuring email.

A wholesale business should establish its substitution rules when it defines the product and agrees customer terms. Some alternatives can be approved in advance. Others require technical review, a customer decision or both. The warehouse should receive an authorised instruction, not an open-ended request to decide what looks close enough.

Define the attributes that matter

Start with the intended use and agreed specification. Depending on the product, relevant differences can include dimensions, material, capacity, compatibility, finish, accessories, pack quantity or the information printed on the packaging.

For an illustrative example, two storage containers may have the same advertised capacity but different external dimensions. The substitute could be unsuitable for a customer's shelving even though its headline specification looks identical. A change to carton quantity may also affect ordering and invoicing without changing the individual product at all.

The product owner maintains the approved specification and any permitted alternatives. Purchasing obtains the proposed replacement's evidence. Quality or technical staff assess the attributes within their responsibility. Sales establishes whether the customer has agreed to that alternative for the particular order.

Keep the proposal separate from the approved product

Microsoft's engineering-change documentation provides a useful model: capture the request, assess its effect on existing transactions, route it to the appropriate reviewers and implement the change after approval. A wholesaler does not need a full engineering system to use that discipline.

Record the original item, proposed replacement, affected quantity, reason and deadline. Attach the specification and any test or sample evidence needed for the decision. Identify the customer orders, stock records and published product information that would be affected.

Do not overwrite the original product description while the proposal is still being reviewed. That can make it impossible to establish what the customer ordered and which stock was actually supplied. Use separate references or controlled versions where the differences need to remain traceable.

Distinguish routine alternatives from exceptions

A documented alternative already approved for the relevant customer and use can follow the normal substitution process. Staff should still check that the approval covers the actual variant, quantity and destination.

An unapproved alternative needs a decision under the established authority rules. Commercial urgency may justify an expedited review, but it does not supply missing evidence of suitability. A salesperson can negotiate delivery dates and prices within their authority; that does not automatically make them the technical approver.

A genuine temporary exception might cover 200 units needed for a confirmed launch while the usual item is unavailable. Its record should state the supporting evidence, who approved it, whether customer consent was required and obtained, the quantity covered and the expiry of the permission. It should not quietly become a permanent catalogue change.

Change the paperwork before releasing the goods

Once approved, amend the relevant purchasing and customer records through the normal process. Confirm the item reference, quantity, price, delivery commitment and any difference in accessories or packaging. Make sure the picking instruction identifies the actual product that may be dispatched.

If customer approval is required, retain it against the order. A request for approval is not approval, and silence should not be treated as consent unless an applicable agreement explicitly provides for that process.

At receipt, the warehouse verifies that the delivered substitute matches the authorised replacement. Receiving an approved alternative does not excuse a different colour, model or case quantity. Any mismatch follows the established discrepancy procedure.

Close the loop after the exception

Review the replacement's performance and any customer feedback. If it is to become a regular alternative, complete the permanent product and commercial approvals. If it was temporary, remove the permission when its scope ends and confirm how remaining stock will be treated.

A controlled substitution can preserve a sale and strengthen the supplier relationship. The value comes from knowing exactly why the alternative is acceptable, who made that decision and which orders it covers. Those details turn “equivalent” into a decision the business can stand behind.

Reference: Microsoft Learn, Manage changes to engineering products. This article adapts change-control principles to wholesale purchasing; examples are illustrative.