diff --git a/assets/js/billing.js b/assets/js/billing.js
index 4c2f680..2666093 100644
--- a/assets/js/billing.js
+++ b/assets/js/billing.js
@@ -3,16 +3,27 @@ function initBillingPage(projectId) {
     const billingAmountInputs = document.querySelectorAll('.billing-amount');
     const totalBillingCell = document.getElementById('total-billing');
 
+    function parseEuroNumber(str) {
+        if (!str) return 0;
+        // Remove thousand separators (.) and replace decimal comma (,) with a period (.)
+        const cleanedStr = str.toString().replace(/\./g, '').replace(',', '.');
+        return parseFloat(cleanedStr);
+    }
+
+    function formatToEuro(num) {
+        return num.toLocaleString('de-DE', { minimumFractionDigits: 2, maximumFractionDigits: 2 });
+    }
+
     function updateTotalBilling() {
         let total = 0;
         billingAmountInputs.forEach(input => {
-            total += parseFloat(input.value) || 0;
+            total += parseEuroNumber(input.value) || 0;
         });
-        totalBillingCell.textContent = `€${total.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 })}`;
+        totalBillingCell.textContent = formatToEuro(total);
     }
 
     billingAmountInputs.forEach(input => {
-        input.addEventListener('keyup', updateTotalBilling);
+        input.addEventListener('input', updateTotalBilling); // Use 'input' for better response
     });
 
     if (saveBtn) {
@@ -21,7 +32,7 @@ function initBillingPage(projectId) {
             billingAmountInputs.forEach(input => {
                 billingData.push({
                     month: input.dataset.month,
-                    amount: input.value
+                    amount: parseEuroNumber(input.value) // Send the parsed number
                 });
             });
 
@@ -50,4 +61,4 @@ function initBillingPage(projectId) {
 
     // Initial calculation
     updateTotalBilling();
-}
+}
\ No newline at end of file
diff --git a/assets/js/project_details.js b/assets/js/project_details.js
index 528d2c5..ac46c32 100644
--- a/assets/js/project_details.js
+++ b/assets/js/project_details.js
@@ -42,27 +42,7 @@ document.addEventListener('DOMContentLoaded', function () {
                 })
                 .then(data => {
                     if (data.success) {
-                        // Replace button with "Overridden" badge
-                        const buttonCell = this.parentElement;
-                        buttonCell.innerHTML = '<span class="badge bg-success">Overridden</span>';
-
-                        updateMetricCell('WIP', month, data.wip);
-                        updateMetricCell('Opening Balance', month, data.openingBalance);
-                        updateMetricCell('Billings', month, data.billings);
-                        updateMetricCell('Expenses', month, data.expenses);
-                        updateMetricCell('Cost', month, data.cost);
-                        updateMetricCell('NSR', month, data.nsr);
-                        updateMetricCell('Margin', month, data.margin);
-
-
-                        // Show the next override button
-                        const nextButtonCell = buttonCell.nextElementSibling;
-                        if (nextButtonCell) {
-                            const nextButton = nextButtonCell.querySelector('.btn-override');
-                            if (nextButton) {
-                                nextButton.style.display = 'block';
-                            }
-                        }
+                        location.reload();
                     } else {
                         alert('Error saving override: ' + (data.message || 'Unknown error.'));
                     }
diff --git a/billing.php b/billing.php
index 9805ab8..3dccd53 100644
--- a/billing.php
+++ b/billing.php
@@ -95,10 +95,10 @@ try {
                                 $totalBilling = 0;
                                 foreach ($billingData as $billingMonth) {
                                     $totalBilling += $billingMonth['amount'];
-                                    echo '<td><input type="number" class="form-control billing-amount" data-month="' . $billingMonth['month'] . '" value="' . htmlspecialchars($billingMonth['amount']) . '"></td>';
+                                    echo '<td><input type="text" class="form-control billing-amount text-end" data-month="' . $billingMonth['month'] . '" value="' . htmlspecialchars(number_format($billingMonth['amount'], 2, ',', '.')) . '"></td>';
                                 }
                                 ?>
-                                <td id="total-billing" class="fw-bold">&euro;<?php echo number_format($totalBilling, 2); ?></td>
+                                <td id="total-billing" class="fw-bold text-end"><?php echo number_format($totalBilling, 2, ',', '.'); ?></td>
                             </tr>
                         </tbody>
                     </table>
diff --git a/export_project_finance.php b/export_project_finance.php
index 04c9ad2..734a1ff 100644
--- a/export_project_finance.php
+++ b/export_project_finance.php
@@ -77,11 +77,11 @@ try {
         $cumulative_billing = 0;
         $cumulative_cost = 0;
         $cumulative_expenses = 0;
-        $previous_month_wip = 0;
+        $previous_month_opening_balance = 0;
 
         foreach ($months as $month) {
             // --- Opening Balance ---
-            $opening_balance = $previous_month_wip;
+            $opening_balance = $previous_month_opening_balance;
             $financial_data['Opening Balance'][$month] = $opening_balance;
 
             // --- Base Data ---
@@ -115,7 +115,7 @@ try {
             $financial_data['Margin'][$month] = $margin;
 
             // --- Carry-over for next iteration ---
-            $previous_month_wip = $financial_data['WIP'][$month];
+            $previous_month_opening_balance = $financial_data['Opening Balance'][$month];
         }
     }
 } catch (PDOException $e) {
diff --git a/project_details.php b/project_details.php
index cc762bc..299b8b6 100644
--- a/project_details.php
+++ b/project_details.php
@@ -108,7 +108,7 @@ if ($project_id) {
         $cumulative_billing = 0;
         $cumulative_cost = 0;
         $cumulative_expenses = 0;
-        $previous_month_wip = 0; // This is the closing balance from the prior month.
+        $previous_month_opening_balance = 0; // Initialize Opening Balance for the first month.
 
         // Fetch all overridden data at once to avoid querying in a loop
         $override_stmt = $pdo->prepare("SELECT month, metricName, value FROM projectFinanceMonthly WHERE projectId = :pid AND is_overridden = 1");
@@ -133,7 +133,8 @@ if ($project_id) {
 
         foreach ($months as $month) {
             // --- Opening Balance ---
-            $opening_balance = $previous_month_wip;
+            // Opening Balance of the current month is the Opening Balance of the previous month.
+            $opening_balance = $previous_month_opening_balance;
             $financial_data['Opening Balance'][$month] = $opening_balance;
             if (isset($overrides[$month]['Opening Balance'])) {
                 $financial_data['Opening Balance'][$month] = $overrides[$month]['Opening Balance'];
@@ -188,8 +189,8 @@ if ($project_id) {
             }
 
             // --- Carry-over for next iteration ---
-            // Update previous month's WIP with the final, possibly overridden, value.
-            $previous_month_wip = $financial_data['WIP'][$month];
+            // The next month's opening balance is this month's final opening balance (including override).
+            $previous_month_opening_balance = $financial_data['Opening Balance'][$month];
         }
     }
 }