diff --git a/RFXtoRP_HsrCarrierApt_SiteForceBookAppointment.ftl b/RFXtoRP_HsrCarrierApt_SiteForceBookAppointment.ftl
index 5d1dbb0..c77f7f5 100644
--- a/RFXtoRP_HsrCarrierApt_SiteForceBookAppointment.ftl
+++ b/RFXtoRP_HsrCarrierApt_SiteForceBookAppointment.ftl
@@ -20,6 +20,9 @@
 		   </#if>
 		   <#assign appointmentType = AppointmentType.APPOINTMENT_TYPE_RECEPTION>
 		   <#assign duration = DurationBetweenTwoDatetimeInSeconds(carrier_apt.planned_unloading_start_datetime?datetime.iso,carrier_apt.planned_unloading_end_datetime?datetime.iso) />
+		   <#if (duration <= 0)>
+			   <#stop "planned_unloading_start_datetime or planned_unloading_end_datetime field of appointmend are not valid" >
+		   </#if>
 		<#else>
 			<#if carrier_apt.unloading_appointment == "false" && carrier_apt.load_appointment == "true" >
 			   <#if carrier_apt.planned_load_start_datetime?starts_with("00") ||  carrier_apt.planned_load_end_datetime?starts_with("00")>
@@ -27,6 +30,9 @@
 		       </#if>
 				<#assign appointmentType = AppointmentType.APPOINTMENT_TYPE_EXPEDITION>
 				<#assign duration = DurationBetweenTwoDatetimeInSeconds(carrier_apt.planned_load_start_datetime?datetime.iso,carrier_apt.planned_load_end_datetime?datetime.iso) />
+				<#if (duration <= 0)>
+					<#stop "planned_unloading_start_datetime or planned_unloading_end_datetime field of appointmend are not valid" >
+				</#if>
 			<#else>
 				<#if carrier_apt.unloading_appointment == "true" && carrier_apt.load_appointment == "true">
 					<#assign appointmentType = AppointmentType.APPOINTMENT_TYPE_BOTH>
diff --git a/RFXtoRP_HsrCarrierApt_SiteForceUpdateAppointment.ftl b/RFXtoRP_HsrCarrierApt_SiteForceUpdateAppointment.ftl
index 48e51c4..79910bf 100644
--- a/RFXtoRP_HsrCarrierApt_SiteForceUpdateAppointment.ftl
+++ b/RFXtoRP_HsrCarrierApt_SiteForceUpdateAppointment.ftl
@@ -73,6 +73,9 @@
 		   </#if>
 		   <#assign appointmentType = AppointmentType.APPOINTMENT_TYPE_RECEPTION>
 		   <#assign duration = DurationBetweenTwoDatetimeInSeconds(carrier_apt.planned_unloading_start_datetime?datetime.iso,carrier_apt.planned_unloading_end_datetime?datetime.iso) />
+		   <#if (duration <= 0)>
+			   <#stop "planned_unloading_start_datetime or planned_unloading_end_datetime field of appointmend are not valid" >
+		   </#if>
 		<#else>
 			<#if carrier_apt.unloading_appointment == "false" && carrier_apt.load_appointment == "true" >
 			   <#if carrier_apt.planned_load_start_datetime?starts_with("00") ||  carrier_apt.planned_load_end_datetime?starts_with("00")>
@@ -80,6 +83,9 @@
 		       </#if>
 				<#assign appointmentType = AppointmentType.APPOINTMENT_TYPE_EXPEDITION>
 				<#assign duration = DurationBetweenTwoDatetimeInSeconds(carrier_apt.planned_load_start_datetime?datetime.iso,carrier_apt.planned_load_end_datetime?datetime.iso) />
+				<#if (duration <= 0)>
+					<#stop "planned_unloading_start_datetime or planned_unloading_end_datetime field of appointmend are not valid" >
+				</#if>
 			<#else>
 				<#if carrier_apt.unloading_appointment == "true" && carrier_apt.load_appointment == "true">
 					<#assign appointmentType = AppointmentType.APPOINTMENT_TYPE_BOTH>