product · inferred from evidence
400 product_invalid_sku
An error code returned by WooCommerce when a duplicate SKU is detected.
- WooCommerce REST API allows duplicate SKUs when SKU is passed via `meta_data`
This was a real bug: when you send `_sku` inside `meta_data`, it bypassed `WC_Product::set_sku()` and went through `MetaDataUtil::update()` instead, so the SKU uniqueness check (`wc_product_has_unique_sku()`) never ran. It was fixed by PR #