diff --git a/RFXtoRP_HsrCarrierApt_SiteForceBookAppointment.ftl b/RFXtoRP_HsrCarrierApt_SiteForceBookAppointment.ftl
index 7d19212..29d17cf 100644
--- a/RFXtoRP_HsrCarrierApt_SiteForceBookAppointment.ftl
+++ b/RFXtoRP_HsrCarrierApt_SiteForceBookAppointment.ftl
@@ -4,7 +4,15 @@
           "ProjectID": "${projectRP}"
         },
 		"ActorID": "${RFXtoRPprefixDepot(carrier_apt.physical_depot?json_string)}",
-		"AppointmentID": "${carrier_apt.appointment_reference?json_string}",
+		<#if carrier_apt.appointment_reference?? && carrier_apt.appointment_reference!="">
+			"AppointmentID": "${carrier_apt.appointment_reference?json_string}",
+		<#else>
+			<#if carrier_apt.constant_appointment?? && carrier_apt.constant_appointment== "true">
+				"AppointmentID": "${carrier_apt.appointment_reference?json_string}${carrier_apt.physical_depot?json_string}${carrier_apt.year_number}${carrier_apt.appointment_number}",
+			<#else>
+				"AppointmentID": "${carrier_apt.physical_depot?json_string}${carrier_apt.year_number}${carrier_apt.appointment_number}",
+			</#if>
+		</#if>
 		"TimeZone":"${time_zone_rfx}",
 		 <#if carrier_apt.unloading_appointment == "true" && carrier_apt.load_appointment == "false">
         	<#if carrier_apt.planned_unloading_start_datetime?starts_with("00") ||  carrier_apt.planned_unloading_end_datetime?starts_with("00")>