Add Fiori UI for Book administration

* Copyied from fiori/app/admin
* Added Supplier + Value Help + Texts
* Fixed bug in replication handler that caused to return wrong data

suppliers/srv/mashup.cds

@@ -8,6 +8,7 @@ using { API_BUSINESS_PARTNER as S4 } from './external/API_BUSINESS_PARTNER.csn';
 
 @cds.autoexpose // or expose explicitly in Catalog and AdminService
 @cds.persistence: {table,skip:false} // add persistency
+@readonly
 entity sap.capire.bookshop.Suppliers as projection on S4.A_BusinessPartner {
     // TODO: Aliases not supported in Java, yet?
     key BusinessPartner as ID,

suppliers/srv/mashup.js

@@ -31,8 +31,10 @@ module.exports = async()=>{ // called by server.js
         if (!replicated) await replicate (supplierId, 'initial');
       };
 
-      if (supplierId) return Promise.all ([ next(), replicateIfNotExists() ])
-      else return next() //> don't forget to pass down the interceptor stack
+      if (supplierId)
+        return (await Promise.all ([ next(), replicateIfNotExists() ]))[0]
+      else
+        return next() //> don't forget to pass down the interceptor stack
     })
 
   })