diff --git a/.github/workflows/UI5.yml b/.github/workflows/UI5.yaml
similarity index 100%
rename from .github/workflows/UI5.yml
rename to .github/workflows/UI5.yaml
diff --git a/.github/workflows/app_test.yaml b/.github/workflows/app_test.yaml
new file mode 100644
index 00000000..02f8122f
--- /dev/null
+++ b/.github/workflows/app_test.yaml
@@ -0,0 +1,21 @@
+name: test_app
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+  test_app:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v3
+
+      - name: Check for changes in src/01/03
+        run: |
+          if git diff --name-only origin/main | grep '^src/01/03/'; then
+            echo "Error: Changes detected in src/01/03. This directory should not be modified. Files will be auto generated. Change files in folder app/ instead. "
+            exit 1
+          else
+            echo "No changes detected in src/01/03."
+          fi
\ No newline at end of file
diff --git a/.github/workflows/auto_app2abap.yml b/.github/workflows/auto_app2abap.yaml
similarity index 100%
rename from .github/workflows/auto_app2abap.yml
rename to .github/workflows/auto_app2abap.yaml
diff --git a/.github/workflows/playwright.yml b/.github/workflows/playwright.yaml
similarity index 100%
rename from .github/workflows/playwright.yml
rename to .github/workflows/playwright.yaml
diff --git a/.github/workflows/rename_test.yml b/.github/workflows/rename_test.yaml
similarity index 100%
rename from .github/workflows/rename_test.yml
rename to .github/workflows/rename_test.yaml
diff --git a/.github/workflows/unit_test.yml b/.github/workflows/unit_test.yaml
similarity index 100%
rename from .github/workflows/unit_test.yml
rename to .github/workflows/unit_test.yaml