When SKULabs ships an order, it marks the order shipped on your sales channel and sends the tracking. If you then void that label in SKULabs, the channel still shows the order as fulfilled. Cancel Channel Fulfillment asks the channel to cancel that fulfillment, so the order can be shipped again.
This works for Shopify stores today.
Where to cancel a channel fulfillment
When you void a label: the void confirmation shows a Cancel Channel Fulfillment checkbox for Shopify shipments. It is unchecked by default; check it to cancel the fulfillment at the same time.
On the order page: tick the shipments and click Cancel Channel Fulfillment next to Void.
In Shipment details: open a shipment with the magnifier button and click Cancel Channel Fulfillment.
On the Shipments page: select orders and use Actions > Cancel Channel Fulfillment.
What happens next
SKULabs queues the cancellation for the channel. On Shopify, the fulfillment usually shows as cancelled within a couple of minutes.
The order goes back to the state it was in before that shipment, for example In progress, so you can ship it again.
If the channel rejected a shipment notification, a warning icon shows on that shipment. Check the order's Activity for the reason.
Careful with the Actions menu: on the Shipments page, Actions works on whole orders. Ticking one shipment inside an expanded order does not narrow it, so the action applies to every eligible shipment on the selected orders. SKULabs tells you how many shipments it will affect before you confirm. To act on a single shipment, use the button inside the expanded order or Shipment details.