custom.js

// define a max for each attribute
// open the console then change the attribute to see the selected id
var max = {
  581: 20,
  582: 10
}

prestashop.on('updatedProduct', function(data) {
  const idProductAttribute = data.id_product_attribute;
  console.log(idProductAttribute);
  if (max[idProductAttribute]) {
    getField('leveys').data('max', max[idProductAttribute]).apply();
  }
});