Question David Gestel · Sep 7, 2022 Add FHIR package for extension and search parameter of type Reference to the FHIR server Following "Adding Custom HL7 FHIR packages to the HL7 FHIR server" at https://learning.intersystems.com/course/view.php?id=1721 I'm able to create an FHIR extension of type string as well as a search parameter. However, I need to create an extension as well as a search parameter of type Reference. And this is not working. Did anyone successfully add an extension and search parameter of type Reference? #FHIR #InterSystems IRIS for Health 0 2 0 416