Extension to provide address validation integration through specific address validation implementation numeric priority value, higher value is of higher priority 1.0.0 <pre> <extension id="org.adempiere.model.FedexAddressValidation" name="FedEx" point="org.adempiere.model.IAddressValidation"> <validation class="org.adempiere.model.FedexAddressValidation" priority="0"> </validation> </extension> C_AddressValidationCfg.AddressValidationClass="org.adempiere.model.FedexAddressValidation" </pre> The class attribute must implement the org.adempiere.model.IAddressValidation class.