diff --git a/packages/bookshop/srv/admin-service.js b/packages/bookshop/srv/admin-service.js
index 5bdfbc95..b6cabf6a 100644
--- a/packages/bookshop/srv/admin-service.js
+++ b/packages/bookshop/srv/admin-service.js
@@ -4,8 +4,10 @@ const cds = require('@sap/cds')
 module.exports = cds.service.impl(srv => {
   const { OrderItems } = srv.entities ('sap.capire.bookshop')
 
+  srv.after (['READ','EDIT'], 'Orders', _calculateTotals)
+ 
   // on-the-fly calculate the total Order price based on the OrderItems' netAmounts
-  srv.after (['READ','EDIT'], 'Orders', async (orders, req) => {
+  async function _calculateTotals (orders, req) {
     const ordersByID = Array.isArray(orders)
       ? orders.reduce ((all,o) => { (all[o.ID] = o).total=0; return all },{})
       : { [orders.ID]: orders }
@@ -15,5 +17,6 @@ module.exports = cds.service.impl(srv => {
     ) .then (items =>
       items.forEach (item => ordersByID [item.parent_ID] .total += item.netAmount)
     )
-  })
+  }
+
 })