From 7933d3f649207bd05c01e23fdb0d01fb240ce98b Mon Sep 17 00:00:00 2001
From: Frank Cools <frank@covago.com>
Date: Thu, 2 Oct 2025 22:44:35 +0200
Subject: [PATCH] Add line TD for absolute VAT due calculation

Fixed:
- Line 25: TVA brute due (Total VAT collected) - always positive
- Line TD: TVA due (absolute value) - never negative, shows abs(net_vat_due)
- Line TD appears between lines 26 and 28 in Section D
- Line TD shows 'TVA due (valeur absolue)' as description
- This ensures VAT due is never negative, even with VAT credits
---
 core/class/declarationtva.class.php | 10 +++++++++-
 declarationtva_view.php             | 11 +++++++++--
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/core/class/declarationtva.class.php b/core/class/declarationtva.class.php
index 0e3983e..31867c4 100644
--- a/core/class/declarationtva.class.php
+++ b/core/class/declarationtva.class.php
@@ -379,7 +379,7 @@ class DeclarationTVA
      */
     private function calculateDSectionLines($declaration_id, $total_vat_collected, $total_vat_deductible)
     {
-        // Line 25: TVA brute due (Total VAT due)
+        // Line 25: TVA brute due (Total VAT due) - always positive
         $line_25_amount = $total_vat_collected;
         $this->createCA3Line($declaration_id, '25', 'Calculated from sections A and B', array(
             'base_amount' => 0,
@@ -398,6 +398,14 @@ class DeclarationTVA
         // Calculate net VAT due
         $net_vat_due = $total_vat_collected - $total_vat_deductible;
 
+        // Line TD: TVA due (VAT due) - absolute value, never negative
+        $line_td_amount = abs($net_vat_due);
+        $this->createCA3Line($declaration_id, 'TD', 'TVA due (absolute value)', array(
+            'base_amount' => 0,
+            'vat_amount' => $line_td_amount,
+            'total_amount' => $line_td_amount
+        ));
+
         // Line 28: TVA nette due (Net VAT due) - if positive
         if ($net_vat_due > 0) {
             $this->createCA3Line($declaration_id, '28', 'Calculated: 25 - 26', array(
diff --git a/declarationtva_view.php b/declarationtva_view.php
index 0a92a83..f7c24f1 100644
--- a/declarationtva_view.php
+++ b/declarationtva_view.php
@@ -262,10 +262,17 @@ print '<th colspan="2">' . $langs->trans("Description") . '</th>';
 print '<th class="right">' . $langs->trans("Amount") . '</th>';
 print '</tr>';
 
-$section_d_lines = array('25', '26', '28', '29');
+$section_d_lines = array('25', '26', 'TD', '28', '29');
 foreach ($section_d_lines as $line) {
     $data = isset($ca3_data[$line]) ? $ca3_data[$line] : array('line_label' => '', 'vat_amount' => 0);
-    $description = isset($ca3_definitions[$line]) ? $ca3_definitions[$line]['label'] : $data['line_label'];
+    
+    // Special handling for line TD
+    if ($line == 'TD') {
+        $description = 'TVA due (valeur absolue)';
+    } else {
+        $description = isset($ca3_definitions[$line]) ? $ca3_definitions[$line]['label'] : $data['line_label'];
+    }
+    
     print '<tr>';
     print '<td>' . $line . '</td>';
     print '<td colspan="2">' . $description . '</td>';