From d21876c14f641f62ac210273ff36486c043a8243 Mon Sep 17 00:00:00 2001
From: Juergen Kunz <juergen@foss.global>
Date: Mon, 27 Oct 2025 08:36:33 +0000
Subject: [PATCH] feat(postingkeys): allow VAT account postings to skip VAT
 amount validation

---
 ts/skr.postingkeys.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/ts/skr.postingkeys.ts b/ts/skr.postingkeys.ts
index 552d61a..9ce57e3 100644
--- a/ts/skr.postingkeys.ts
+++ b/ts/skr.postingkeys.ts
@@ -85,7 +85,9 @@ export function validatePostingKey(
   }
 
   // Validate VAT requirement
-  if (rule.requiresVAT && !vatAmount) {
+  // Skip VAT amount requirement if posting TO a VAT account (the line itself IS the VAT)
+  const isVATAccount = accountNumber === '1571' || accountNumber === '1771' || accountNumber === '1576';
+  if (rule.requiresVAT && !vatAmount && !isVATAccount) {
     errors.push(
       `Posting key ${postingKey} requires VAT amount, but none provided. ` +
       `Description: ${rule.description}`