code: @Override
  	public CPInstance fetchByC_S(long CPDefinitionId, String sku) {
  		return fetchByC_S(CPDefinitionId, sku, true);
  	}
docs: Returns the cp instance where CPDefinitionId = &#63; and sku = &#63; or returns <code>null</code> if it could not be found. Uses the finder cache.
  
  @param CPDefinitionId the cp definition ID
  @param sku the sku
  @return the matching cp instance, or <code>null</code> if a matching cp instance could not be found