code: public static CommerceTaxFixedRate fetchByC_C(long CPTaxCategoryId,
  		long commerceTaxMethodId, boolean retrieveFromCache) {
  		return getPersistence()
  				   .fetchByC_C(CPTaxCategoryId, commerceTaxMethodId,
  			retrieveFromCache);
  	}
docs: Returns the commerce tax fixed rate where CPTaxCategoryId = &#63; and commerceTaxMethodId = &#63; or returns <code>null</code> if it could not be found, optionally using the finder cache.
  
  @param CPTaxCategoryId the cp tax category ID
  @param commerceTaxMethodId the commerce tax method ID
  @param retrieveFromCache whether to retrieve from the finder cache
  @return the matching commerce tax fixed rate, or <code>null</code> if a matching commerce tax fixed rate could not be found