Split Order Button Disabled

Hi,

Yes, those two meta keys are the reason the Split order button is being disabled.

Since version 1.5.0, Order Splitter treats private line-item metadata (keys beginning with _) as unclassified unless its behavior is explicitly declared. This is a safety measure to prevent third-party metadata from being copied or ignored incorrectly during a split.

For WooCommerce Wholesale Prices, these two keys should be treated as business metadata:

add_filter(
    'wcos_order_item_meta_classification',
    static function ( $classification, $key ) {
        $business_keys = array(
            '_wwp_wholesale_priced',
            '_wwp_wholesale_role',
        );

        if ( in_array( (string) $key, $business_keys, true ) ) {
            return 'business';
        }

        return $classification;
    },
    10,
    2
);

You can add this using a small custom plugin, a mu-plugin, or a snippets plugin. After adding it, the Split order button should become available again for those orders.

Best regards,