diff --git a/RFXtoRP_HsrPro_ExecutionflowDetected.ftl b/RFXtoRP_HsrPro_ExecutionflowDetected.ftl
index e113a8e..76779ac 100644
--- a/RFXtoRP_HsrPro_ExecutionflowDetected.ftl
+++ b/RFXtoRP_HsrPro_ExecutionflowDetected.ftl
@@ -12,7 +12,7 @@
       <#if preparation_order.originator_reference?? && preparation_order.originator_reference!="">
         "RefID": "${preparation_order.physical_depot_code?trim?json_string}${preparation_order.activity_code?trim?json_string}${preparation_order.originator_code?trim?json_string}${preparation_order.originator_reference?trim?json_string}",
       <#else>
-        "RefID": "${preparation_order.physical_depot_code?trim?json_string}${preparation_order.activity_code?trim?json_string}${preparation_order.originator_code?trim?json_string}${preparation_order.preparation_order_year}${preparation_order.preparation_order_number}",
+        "RefID": "O${preparation_order.physical_depot_code?trim?json_string}${preparation_order.activity_code?trim?json_string}${preparation_order.originator_code?trim?json_string}${preparation_order.preparation_order_year}${preparation_order.preparation_order_number}",
       </#if>
     "RefDate": {
             "DateTime": "${pro_creation_datetime}",