diff --git a/RFXtoRP_HsrPro_ExecutionflowDetected.ftl b/RFXtoRP_HsrPro_ExecutionflowDetected.ftl
index 04ed23e..d57a789 100644
--- a/RFXtoRP_HsrPro_ExecutionflowDetected.ftl
+++ b/RFXtoRP_HsrPro_ExecutionflowDetected.ftl
@@ -85,7 +85,7 @@
         <#if preparation_order.originator_reference?? && preparation_order.originator_reference!="">
           "OrderID": "${preparation_order.originator_reference?trim?json_string}",
         <#else>
-          "OrderID": "${preparation_order.physical_depot_code}${preparation_order.activity_code}${preparation_order.originator_code}${preparation_order.preparation_order_year}${preparation_order.preparation_order_number}",
+          "OrderID": "O${preparation_order.physical_depot_code}${preparation_order.activity_code}${preparation_order.originator_code}${preparation_order.preparation_order_year}${preparation_order.preparation_order_number}",
         </#if>
        <#if preparation_order.line_list??>
        "Lines" : [
diff --git a/RFXtoRP_HsrReceiptList_ExecutionflowDetected.ftl b/RFXtoRP_HsrReceiptList_ExecutionflowDetected.ftl
index 78f7727..56f2c78 100644
--- a/RFXtoRP_HsrReceiptList_ExecutionflowDetected.ftl
+++ b/RFXtoRP_HsrReceiptList_ExecutionflowDetected.ftl
@@ -51,7 +51,7 @@
       <#if receipt.receipt_reference?? && receipt.receipt_reference!="">
         "OrderID": "${receipt.receipt_reference?trim?json_string}",
       <#else>
-        "OrderID": "${receipt.physical_depot_code?trim?json_string}${receipt.activity_code?trim?json_string}${receipt.originator_code?trim?json_string}${receipt.receipt_year?trim?json_string}${receipt.receipt_number?trim?json_string}",
+        "OrderID": "R${receipt.physical_depot_code?trim?json_string}${receipt.activity_code?trim?json_string}${receipt.originator_code?trim?json_string}${receipt.receipt_year?trim?json_string}${receipt.receipt_number?trim?json_string}",
       </#if>
       <#if receipt.line_list??>
        "Lines" : [