Manuelle Buchungen um DATEV-Steuerschlüssel und getrennte Soll/Haben-Auswahl erweitern

backend/src/routes/banking.ts

@@ -48,6 +48,7 @@ export default async function bankingRoutes(server: FastifyInstance) {
             next.contraCustomer = null
             next.contraVendor = null
             next.contraOwnaccount = null
+            next.datevTaxKey = next.datevTaxKey ? String(next.datevTaxKey).trim() : null
             return { data: next }
         }
 
@@ -71,6 +72,7 @@ export default async function bankingRoutes(server: FastifyInstance) {
         next.amount = Math.abs(Number(next.amount))
         next.bankstatement = null
         next.manualBookingDate = dayjs(next.manualBookingDate).format("YYYY-MM-DD")
+        next.datevTaxKey = next.datevTaxKey ? String(next.datevTaxKey).trim() : null
 
         return { data: next }
     }