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Problems you might hit with your inventory, and how to fix them.
Why it happens. Updating a variant by CSV in Shopify replaces the variant ID without telling Supercycle, so the items lose their link to it.How to fix it. Re-link the items from the Inventory table.
1

Filter to unlinked items

On Inventory, filter Variant to Unlinked.
2

Select the items

Tick the items you’re re-linking.
3

Update the product

Select Actions, then Update product, and pick the new variant.
If items stay unlinked after the update, contact support from the app with the product handle and two or three affected serials.
Why it happens. Two customers checked out the same last item at the same time. Availability is checked when each cart is built, so both can pass, and the second order to land finds nothing available. Supercycle creates the cycle without an item rather than hand it one that’s already out, so the existing booking isn’t disturbed.The cycle page shows No item with a red Oversold badge, the cycles table carries a red No item flag, and the variant shows a red oversold badge on the product page with a warning banner on the variant page. Cycles sold on a variant with overselling turned on show No item assigned instead, and aren’t flagged as a problem.How to fix it. Give the cycle an item, or add stock to the variant.
1

Find the cycles

On the variant page, select View cycles in the Oversold by N items banner. To see them across your catalog, filter the cycles table by Oversell status → No item.
2

Assign an item

Open the cycle and select Assign item in the item box. It’s disabled until the variant has an available item.
3

Add inventory

With nothing available, select Add inventory to create a new item for the variant.
The banner’s count is how many more items would cover every cycle sold without one, not how many cycles there are: one item can stand in for several cycles whose dates don’t overlap. Once a cycle has an item, the count drops.To keep this rare, hold stock while a customer decides. Turn on the cart timer so items don’t sit in abandoned carts, and leave Reserve inventory automatically on so items on unpaid draft orders can’t be booked by someone else.
Why it happens. Supercycle blocks deletion while an item has cycles on record, so deleting it wouldn’t lose that history. The message reads Item #1042 can’t be deleted because it has cycles. Retire the item instead.How to fix it. Retire the item instead. That stops new cycles being booked on it and keeps everything that has already happened to it. A bulk delete does this for you: it removes the items with no cycles and skips the rest.