Working template: Inventory sync: prevent overselling across store, ERP and warehouse

Editorial working template
https://www.ecommerce.spot/en/guides/inventory-sync-prevent-overselling
Reviewed: 2026-10-24

Record your own quantities, decisions and acceptance evidence. This editorial planning template does not replace a provider proposal for your specific requirements.

Project / owners / date:
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Inventory sync should publish a defined sellable quantity from an accountable source, with explicit reservations, holds and location rules. Combine change notifications with reconciliation to detect missed updates. Test the final unit, cancellation, bundles and recovery; synchronization alone does not eliminate every race between simultaneous purchases.

1. Availability definition
Record the owning system and the treatment of reserved, unavailable and incoming quantities.
Your inputs / decision:
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Evidence / owner / unresolved issue:
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2. Identity and location mapping
Map variants, locations, bundle components and the handling of unmapped or archived items.
Your inputs / decision:
________________________________________
Evidence / owner / unresolved issue:
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3. Reconciliation plan
Define comparison scope, cadence, owner, discrepancy evidence and permitted corrections.
Your inputs / decision:
________________________________________
Evidence / owner / unresolved issue:
________________________________________

4. Acceptance cases
Record last-unit, simultaneous purchase, cancellation, partial shipment and return results.
Your inputs / decision:
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Evidence / owner / unresolved issue:
________________________________________

5. Recovery record
Capture the cause, approved action, stable reference and reconciled final quantities.
Your inputs / decision:
________________________________________
Evidence / owner / unresolved issue:
________________________________________

Acceptance checklist
[ ] Sellable stock has one documented business definition.
[ ] Reservations, holds and incoming quantities are distinguished.
[ ] Location and variant mappings are explicit.
[ ] Bundles reserve the intended components.
[ ] Repeated or stale updates have defined handling.
[ ] A reconciliation process detects missing changes.
[ ] The last-unit and cancellation cases are tested.
[ ] Operators have a controlled, traceable recovery path.

Article references
Shopify: Inventory states: https://help.shopify.com/en/manual/inventory-and-locations/fundamentals/inventory-states
Shopify: Webhooks: https://shopify.dev/docs/apps/build/webhooks