When a wholesale SKU is short, the portal should flag the line and let the buyer accept a mapped substitute, backorder, or remove it. Silent swaps break trust. Week one on Parcel Build is that first working version for known accounts. You own the code. Flat monthly. See custom software for wholesalers. If out-of-stock substitutions in the portal is the gap, start a free 30-day build.
Should wholesale substitutions be automatic or buyer-approved?
Buyer-approved. Week one flags the short line, shows mapped alternates your team already trusts, and requires accept, reject, backorder, or remove before the order moves. Automatic swaps without a clear buyer choice create packing surprises and returns.
Why phone swaps and packing-slip surprises create returns and chargebacks
Someone calls to swap a short SKU. The buyer thinks they ordered one thing. The packing slip shows another. Returns and chargebacks follow because the accept step never happened in a place both sides can see.
Phone swaps also leave no clean record of which alternate was offered, which the buyer refused, and which line stayed on backorder. The portal path keeps that decision on the order.
What week one can cover
Short-line flags at cart or confirm. Mapped substitute options your ops team maintains. Buyer accept, reject, backorder, or remove. Account flags for "no substitutes" when that rule applies. A re-check of price list and MOQ on the substitute before confirm when those rules already exist.
On Parcel Build, week one is a first working version of that path. Flat monthly. You own the code.
What stays out of month one
Defer AI similarity engines as the primary path. Defer every cross-reference catalog science project. Month one is mapped alternates, buyer choice, and a clear record on the order for known accounts.
FAQ
Can some accounts be marked "no substitutes" while others see options?
Yes. Week one can keep a per-account flag so some buyers never see substitutes while others get mapped options. That is a common named gap when brand or contract rules differ by account.
Do substitute lines need to re-check price lists and MOQ before confirm?
Yes when those rules already govern the account. A substitute should not bypass the price list or case-pack rules the original line would have followed. Week one can re-check before the buyer confirms.
Next step
If out-of-stock substitutions in a wholesale portal is what feels hardest, start a free 30-day build. Name that gap on the form. We scope a free 30-day build on that problem: first working version in week one, flat monthly after if you want to continue.