diff --git a/backend/src/controllers/atemschutz.controller.ts b/backend/src/controllers/atemschutz.controller.ts
index d349e24..39e1d1e 100644
--- a/backend/src/controllers/atemschutz.controller.ts
+++ b/backend/src/controllers/atemschutz.controller.ts
@@ -59,8 +59,10 @@ class AtemschutzController {
 
   async create(req: Request, res: Response): Promise<void> {
     try {
+      logger.info('Atemschutz create - raw body:', { body: req.body });
       const parsed = CreateAtemschutzSchema.safeParse(req.body);
       if (!parsed.success) {
+        logger.warn('Atemschutz create - validation failed:', { errors: parsed.error.flatten() });
         res.status(400).json({
           success: false,
           message: 'Validierungsfehler',
@@ -68,6 +70,7 @@ class AtemschutzController {
         });
         return;
       }
+      logger.info('Atemschutz create - parsed data:', { data: parsed.data });
       const record = await atemschutzService.create(parsed.data, getUserId(req));
       res.status(201).json({ success: true, data: record });
     } catch (error: any) {
diff --git a/frontend/src/pages/Atemschutz.tsx b/frontend/src/pages/Atemschutz.tsx
index 16a51e7..2c75fcb 100644
--- a/frontend/src/pages/Atemschutz.tsx
+++ b/frontend/src/pages/Atemschutz.tsx
@@ -263,6 +263,16 @@ function Atemschutz() {
       return;
     }
 
+    // Debug: show form state in alert so we can see exactly what's being sent
+    const debugPayload = {
+      lehrgang_datum: form.lehrgang_datum || '(empty)',
+      untersuchung_datum: form.untersuchung_datum || '(empty)',
+      untersuchung_gueltig_bis: form.untersuchung_gueltig_bis || '(empty)',
+      leistungstest_datum: form.leistungstest_datum || '(empty)',
+      leistungstest_gueltig_bis: form.leistungstest_gueltig_bis || '(empty)',
+    };
+    alert('DEBUG form dates:\n' + JSON.stringify(debugPayload, null, 2));
+
     setDialogLoading(true);
     try {
       if (editingId) {