diff --git a/docs/api/openapi.json b/docs/api/openapi.json
index eef12c7..362f1e0 100644
--- a/docs/api/openapi.json
+++ b/docs/api/openapi.json
@@ -4330,7 +4330,7 @@
         },
         "responses": {
           "200": {
-            "description": "`text/event-stream` — emits `status`, `llm_call`, `tool_call`, `usage`,\n`progress`, `result` (and `error` on failure). See SSE Events table below.\n\n**ManifestResult shape** (used by `progress` and `result`):\n\n```json\n{\n  \"basedata\": {\n    \"date\": \"2026-01-15\",\n    \"kLieferant\": 42,\n    \"lieferantName\": \"Muster GmbH\",\n    \"manifestNr\": \"LS-2026-001\",\n    \"manifestType\": \"lieferschein\"\n  },\n  \"notes\": [\"Pos. 3: VPE-Angabe fehlte, Standardwert 1 angenommen.\"],\n  \"items\": {\n    \"pagesFrom\": 1,\n    \"pagesTo\": 2,\n    \"items\": [\n      {\n        \"position\": 1,\n        \"count\": 10,\n        \"vpe\": 1,\n        \"unit\": \"Stk.\",\n        \"articleName\": \"Einhängesieb Stahl\",\n        \"liefArtNr\": \"ES-100\",\n        \"mwst\": \"19\",\n        \"eknetto\": 450,\n        \"page\": 1\n      }\n    ]\n  }\n}\n```\n",
+            "description": "`text/event-stream` — emits `status`, `llm_call`, `tool_call`, `usage`,\n`progress`, `result` (and `error` on failure). See SSE Events table below.\n\n**ManifestResult shape** (used by `progress` and `result`):\n\n```json\n{\n  \"basedata\": {\n    \"date\": \"2026-01-15\",\n    \"lieferant_id\": 42,\n    \"lieferantName\": \"Muster GmbH\",\n    \"manifestNr\": \"LS-2026-001\",\n    \"manifestType\": \"lieferschein\"\n  },\n  \"notes\": [\"Pos. 3: VPE-Angabe fehlte, Standardwert 1 angenommen.\"],\n  \"items\": {\n    \"pagesFrom\": 1,\n    \"pagesTo\": 2,\n    \"items\": [\n      {\n        \"position\": 1,\n        \"count\": 10,\n        \"vpe\": 1,\n        \"unit\": \"Stk.\",\n        \"articleName\": \"Einhängesieb Stahl\",\n        \"liefArtNr\": \"ES-100\",\n        \"mwst\": \"19\",\n        \"eknetto\": 450,\n        \"page\": 1\n      }\n    ]\n  }\n}\n```\n",
             "content": {
               "text/event-stream": {
                 "schema": {
diff --git a/docs/api/routes/delivery/parse.md b/docs/api/routes/delivery/parse.md
index 5708112..c8cf3f5 100644
--- a/docs/api/routes/delivery/parse.md
+++ b/docs/api/routes/delivery/parse.md
@@ -51,7 +51,7 @@ The response is a `text/event-stream`. Events are emitted in order until the str
 {
   "basedata": {
     "date": "2026-01-15",
-    "kLieferant": 42,
+    "lieferant_id": 42,
     "lieferantName": "Muster GmbH",
     "manifestNr": "LS-2026-001",
     "manifestType": "lieferschein"
diff --git a/src/api/routes/deliveryParse.js b/src/api/routes/deliveryParse.js
index 047603e..b136ceb 100644
--- a/src/api/routes/deliveryParse.js
+++ b/src/api/routes/deliveryParse.js
@@ -4,6 +4,7 @@ import { execFileSync } from 'child_process';
 import multer from 'multer';
 import { LLMOrbiter, OpenRouterProvider, defineTool, DirectReturnError } from 'libllmorbiter';
 import * as dbCompanySetting from '../../db/companysetting.js';
+import * as dbSupplier from '../../db/supplier.js';
 
 // ─── Multer — memory storage (no temp files); accepts PDF or text ───────────────
 const upload = multer({
@@ -67,7 +68,7 @@ Rules:
 - manifestType: "rechnung" or "lieferschein". For "lieferschein", prices and taxes must be null.
 - Exclude non-product lines (shipping, handling, etc.).
 - Line items: Extract count, vpe (default: 1), liefArtNr, mwst (7 or 19), and eknetto per piece(euro cents).
-- Match supplier against the provided list for kLieferant and lieferantName. For unknown suppliers, extract lieferantName and set kLieferant to null.
+- Match supplier against the provided list for lieferant_id and lieferantName. For unknown suppliers, extract lieferantName and set lieferant_id to null.
 - Write notes strictly in German.
 - The output_manifest tool has three strictly optional components: basedata, notes, items. Only include a component when it carries genuinely new data for this batch; omit the rest.
 - Include basedata ONLY when at least one of its fields is currently null/empty and you can fill it in, or when a value actually changes. If all basedata fields are already set and unchanged, omit basedata.
@@ -89,6 +90,17 @@ Unit (ME) rules:
 - A packaging size like "VE100" means the bulk pack contains 100 individual items: set vpe = 100 and unit = the individual item (e.g. Stk.).
 - Example: "Einhängesiebe Stahl, VE100" -> vpe = 100, unit = "Stk.", count = 1 (one bulk pack of 100 sieves).`;
 
+function buildSystemPrompt(suppliers = []) {
+    const supplierList = suppliers.length > 0
+        ? suppliers.map((s) => `${s.id} | ${s.name}`).join('\n')
+        : '(no suppliers registered)';
+
+    return `${BASE_PROMPT}
+
+Suppliers (lieferant_id | lieferant_name):
+${supplierList}`;
+}
+
 // ─── Shared SSE manifest extraction (POST /delivery/parse) ─────────────────────
 /**
  * Fetches the OpenRouter API key, opens the SSE stream, and runs the LLM
@@ -113,6 +125,14 @@ async function parseDocumentManifest({ req, res, pages, sourceLabel }) {
         return res.status(400).json({ error: 'OpenRouter API key not configured (companysetting: keys.openrouter)' });
     }
 
+    // ── Fetch suppliers from Lieferanten group ────────────────────────
+    let suppliers = [];
+    try {
+        suppliers = await dbSupplier.list(req.user.id);
+    } catch (err) {
+        console.warn('delivery parse: failed to list suppliers:', err?.message || err);
+    }
+
     // ── Open SSE stream ──────────────────────────────────────────────
     res.setHeader('Content-Type', 'text/event-stream');
     res.setHeader('Cache-Control', 'no-cache');
@@ -124,7 +144,7 @@ async function parseDocumentManifest({ req, res, pages, sourceLabel }) {
     // ── Accumulated state ────────────────────────────────────────────
     const manifestBasedata = {
         date: null,
-        kLieferant: null,
+        lieferant_id: null,
         lieferantName: null,
         manifestNr: null,
         manifestType: null,
@@ -151,7 +171,7 @@ async function parseDocumentManifest({ req, res, pages, sourceLabel }) {
                             additionalProperties: false,
                             properties: {
                                 date: { type: ['string', 'null'], description: 'Document date (ISO 8601)' },
-                                kLieferant: { type: ['number', 'null'], description: 'Lieferant ID' },
+                                lieferant_id: { type: ['number', 'null'], description: 'Lieferant ID' },
                                 lieferantName: { type: 'string', description: 'Lieferant name' },
                                 manifestNr: { type: ['string', 'null'], description: 'Lieferscheinnummer or Rechnungsnummer' },
                                 manifestType: {
@@ -219,9 +239,15 @@ async function parseDocumentManifest({ req, res, pages, sourceLabel }) {
 
             // Merge basedata
             if (args.basedata && typeof args.basedata === 'object') {
-                for (const key of ['date', 'kLieferant', 'lieferantName', 'manifestNr', 'manifestType']) {
+                for (const key of ['date', 'lieferant_id', 'lieferantName', 'manifestNr', 'manifestType']) {
                     if (args.basedata[key] != null) manifestBasedata[key] = args.basedata[key];
                 }
+                if (args.basedata.kLieferant != null && manifestBasedata.lieferant_id == null) {
+                    manifestBasedata.lieferant_id = args.basedata.kLieferant;
+                }
+                if (args.basedata.lieferant_name != null && manifestBasedata.lieferantName == null) {
+                    manifestBasedata.lieferantName = args.basedata.lieferant_name;
+                }
             }
             // Merge notes
             if (Array.isArray(args.notes)) {
@@ -343,9 +369,9 @@ async function parseDocumentManifest({ req, res, pages, sourceLabel }) {
             .map((p, idx) => `--- Page ${idx + 1} of ${pages.length} ---\n${p}`)
             .join('\n\n');
 
-        const prompt = `${BASE_PROMPT}
+        const systemPrompt = buildSystemPrompt(suppliers);
 
-You are processing all ${pages.length} page(s) of this document.
+        const prompt = `You are processing all ${pages.length} page(s) of this document.
 
 Current manifest_basedata (fill in what is still missing):
 ${JSON.stringify(manifestBasedata, null, 2)}
@@ -359,9 +385,15 @@ ${JSON.stringify(manifestItems, null, 2)}
 Page content:
 ${pageContent}`;
 
-        console.log(`[llmorbiter] Starting run: model=${model}, pages=${pages.length} (${sourceLabel})`);
+        console.log(`[llmorbiter] Starting run: model=${model}, pages=${pages.length} (${sourceLabel}), suppliers=${suppliers.length}`);
         currentPage = 1;
-        await orbiter.run({ prompt, model, tools: [outputManifestTool], signal: abortController.signal });
+        await orbiter.run({
+            prompt,
+            systemPrompt,
+            model,
+            tools: [outputManifestTool],
+            signal: abortController.signal,
+        });
         console.log(`[llmorbiter] Run completed successfully. Extracted ${manifestItems.items.length} item(s), ${manifestNotes.length} note(s)`);
     } catch (err) {
         if (err.name === 'AbortError' || abortController.signal.aborted) {
@@ -468,7 +500,7 @@ export function register(app, basePath = '') {
      *           {
      *             "basedata": {
      *               "date": "2026-01-15",
-     *               "kLieferant": 42,
+     *               "lieferant_id": 42,
      *               "lieferantName": "Muster GmbH",
      *               "manifestNr": "LS-2026-001",
      *               "manifestType": "lieferschein"