hanatrial and "enable OData4SAP;" gives invalid XML for $metadata as the sap prefix is not declared

I have in my CDS file an entity with an atribute of type LocalDate. If I publish this with xsodata inlcluding"enable OData4SAP;" in the $metadata document the sap prefix is not declared, but used in sap:display-format="Date" , which makes XML validation fail with "Namespace prefix sap for display-format on Property is not defined".

Any ideas to work around this instead of not using "enable OData4SAP;"?