CHECKOUT301: SKU duplicate
What this means
Checkout cannot continue because a product SKU is duplicated or invalid.
Change or remove the named SKU, then retry with the preserved cart.
Your data
The order itself is safe and unchanged.
Troubleshoot
- The log entry names the SKU the store refused.
At the till: this product can't be sold until its SKU is fixed — remove the line from the cart, set the item aside, and complete the rest of the sale now. Come back to it once the store is corrected.
On the store — for the site administrator:
- In WP Admin, search Products for that SKU. If two products (or a product and a variation) share it, give each a unique SKU. If only one product has it, the SKU itself is malformed — correct it on that product.
- Once the SKU is unique and valid, the till can add the item and complete the sale (the cart is preserved).