SKU update on WooCommerce product

I need to update the SKU of a WooCommerce product but nothing I tried works.

I'm trying to update the SKU of a product. I build a new select custom field (´´id=>'_leadlovers_integration_product'´´ on the code below) on the inventory settings with options I import by API from another plataform). This works fine. I can save the code, print it. But I can´t simply make the update of the SKU with this code.

I've tried a lot of snipets but nothing works...

add_action( 'woocommerce_process_product_meta', 'save_leadlovers_custom_fields');
function save_leadlovers_custom_fields( $post_id )
{
    //These two guys works perfectly
    update_post_meta( $post_id, '_leadlovers_integration_check', esc_attr( $_POST['_leadlovers_integration_check'] ) );
    update_post_meta( $post_id, '_leadlovers_integration_product', esc_attr( $_POST['_leadlovers_integration_product'] ) );
    
    //First, I tried this... no success
    //update_post_meta( $post_id, '_sku', esc_attr( $_POST['_leadlovers_integration_product'] ) );

    //Then I tried this, with no changes, forcing by hand the 
    //update_post_meta( $post_id, '_sku', '30445' );

    //I tried using the function set_sku() too... nothing happens
    //$product = wc_get_product( $post_id );
    //$product->set_sku( get_post_meta( $post->ID, '_leadlovers_integration_product', true ) );

    //nothing too with this...
        $product = wc_get_product( $post_id );
    $product->set_sku( '30445' ) ;

        ///i tried even make the procedure on other function...

}

Well, someone have an idea what happens, or... not happens??

Thanks,

update_post_meta should actually work fine. You should still use this last save function for the other set_sku function. In that:

    $product = wc_get_product( $post_id );
    $product->set_sku( '30445' );
    $product->save();

If that doesn't work either, there's a problem with your woocommerce_process_product_meta hook or it's not working for the time you want it to.

EDIT

Or this I'm guessing. You might actually be using a hook too early to save meta. So you are saving something but again _sku is saved again right after your function. So you should try a different hook to make sure it works at the right time. It would be nice if you could provide more details so that I can assist you.

EDIT 2

I reviewed it again maybe the hook should work. Can you delay the runtime by trying this?

add_action( 'woocommerce_process_product_meta', 'save_leadlovers_custom_fields', 50);