From a71ea577b25d1fb5f2fd5a906075470a511f4794 Mon Sep 17 00:00:00 2001
From: flfeders <f.federspiel@federspiel.tech>
Date: Tue, 11 Aug 2026 13:41:01 +0200
Subject: [PATCH] =?UTF-8?q?DATEV-Automatikkonten=20mit=20Bruttobetr=C3=A4g?=
 =?UTF-8?q?en=20exportieren?=
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---
 backend/src/utils/export/datev.ts |  6 +++---
 backend/tests/datevExport.test.ts | 29 +++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 3 deletions(-)
 create mode 100644 backend/tests/datevExport.test.ts

diff --git a/backend/src/utils/export/datev.ts b/backend/src/utils/export/datev.ts
index 7b8ab81..1182d24 100644
--- a/backend/src/utils/export/datev.ts
+++ b/backend/src/utils/export/datev.ts
@@ -93,7 +93,7 @@ const getIncomingInvoiceTaxOverride = (invoice: any) => {
     };
 };
 
-const getCreatedDocumentRevenueLines = (document: any) => {
+export const getCreatedDocumentRevenueLines = (document: any) => {
     const totals = getCreatedDocumentTotal(document);
 
     if (document.taxType === "13b UStG") {
@@ -105,8 +105,8 @@ const getCreatedDocumentRevenueLines = (document: any) => {
     }
 
     return [
-        { account: "8400", amount: Number(totals.net19.toFixed(2)) },
-        { account: "8334", amount: Number(totals.net7.toFixed(2)) },
+        { account: "8400", amount: Number((totals.net19 + totals.total19).toFixed(2)) },
+        { account: "8334", amount: Number((totals.net7 + totals.total7).toFixed(2)) },
         { account: "8290", amount: Number(totals.net0.toFixed(2)) },
     ].filter((line) => line.amount !== 0);
 };
diff --git a/backend/tests/datevExport.test.ts b/backend/tests/datevExport.test.ts
new file mode 100644
index 0000000..6ee7644
--- /dev/null
+++ b/backend/tests/datevExport.test.ts
@@ -0,0 +1,29 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import { getCreatedDocumentRevenueLines } from "../src/utils/export/datev";
+
+test("exports gross amounts for DATEV automatic revenue accounts", () => {
+    const revenueLines = getCreatedDocumentRevenueLines({
+        rows: [
+            { mode: "position", quantity: 1, price: 100, discountPercent: 0, taxPercent: 19 },
+            { mode: "position", quantity: 2, price: 50, discountPercent: 0, taxPercent: 7 },
+            { mode: "position", quantity: 1, price: 50, discountPercent: 0, taxPercent: 0 },
+        ],
+    });
+
+    assert.deepEqual(revenueLines, [
+        { account: "8400", amount: 119 },
+        { account: "8334", amount: 107 },
+        { account: "8290", amount: 50 },
+    ]);
+});
+
+test("preserves negative gross amounts for cancellations", () => {
+    const revenueLines = getCreatedDocumentRevenueLines({
+        rows: [
+            { mode: "position", quantity: -1, price: 100, discountPercent: 0, taxPercent: 19 },
+        ],
+    });
+
+    assert.deepEqual(revenueLines, [{ account: "8400", amount: -119 }]);
+});