diff --git a/src/routes/resources.ts b/src/routes/resources.ts
index 0527b90..5b5dad8 100644
--- a/src/routes/resources.ts
+++ b/src/routes/resources.ts
@@ -2,6 +2,7 @@ import { FastifyInstance } from "fastify";
 import {insertHistoryItem } from "../utils/history"
 import {diffObjects} from "../utils/diff";
 import {sortData} from "../utils/sort";
+import {useNextNumberRangeNumber} from "../utils/functions";
 
 
 const dataTypes: any[] = {
@@ -531,14 +532,24 @@ export default async function resourceRoutes(server: FastifyInstance) {
         const body = req.body as Record<string, any>;
 
         const dataType = dataTypes[resource];
+        let createData = {
+            ...body,
+            tenant: req.user.tenant_id,
+            archived: false, // Standardwert
+        }
+
+        if(dataType.numberRangeHolder && !body[dataType.numberRangeHolder]) {
+            const result = await useNextNumberRangeNumber(server,req.user.tenant_id, resource)
+            createData[dataType.numberRangeHolder] = result.usedNumber
+        }
+
+
+
+
 
         const { data, error } = await server.supabase
             .from(resource)
-            .insert({
-                ...body,
-                tenant: req.user.tenant_id,
-                archived: false, // Standardwert
-            })
+            .insert(createData)
             .select("*")
             .single();