Hi,

Try to add the following code instead

function basel_woocommerce_hooks_child() {

		remove_action( 'basel_woocommerce_after_sidebar', 'woocommerce_upsell_display', 10 );
		remove_action( 'basel_woocommerce_after_sidebar', 'woocommerce_output_related_products', 20 );

	}

	add_action( 'wp', 'basel_woocommerce_hooks_child', 2000 );