docs: public static com.liferay.commerce.shipping.engine.fixed.model.CommerceShippingFixedOptionRel addCommerceShippingFixedOptionRel(
  		com.liferay.commerce.shipping.engine.fixed.model.CommerceShippingFixedOptionRel commerceShippingFixedOptionRel) {
  		return getService()
  				   .addCommerceShippingFixedOptionRel(commerceShippingFixedOptionRel);
  	}