Add getBankAccountDetails method for bank journal entries

- Add getBankAccountDetails method copied from PDF class
- This method gets bank account details and returns the linked accounting account code
- Fixes the issue where bank account code is not found for bank journal entries
- Uses the same logic that works in PDF generation

core/class/declarationtva.class.php

@@ -1451,6 +1451,40 @@ class DeclarationTVA
         
         return $account_code; // Fallback to account code
     }
+
+    /**
+     * Get bank account details
+     *
+     * @param int $bank_account_id Bank account ID
+     * @return array|false Bank account details or false if not found
+     */
+    private function getBankAccountDetails($bank_account_id)
+    {
+        // Get bank account info and its linked accounting account
+        $sql = "SELECT ba.rowid, ba.label, ba.number, ba.bank, ba.account_number
+                FROM " . MAIN_DB_PREFIX . "bank_account ba
+                WHERE ba.rowid = " . (int)$bank_account_id . " 
+                AND ba.entity = " . $this->entity;
+        
+        $result = $this->db->query($sql);
+        if ($result && $this->db->num_rows($result) > 0) {
+            $obj = $this->db->fetch_object($result);
+            
+            // Get the accounting account label for the account code
+            $account_label = $this->getAccountLabel($obj->account_number);
+            
+            return array(
+                'rowid' => $obj->rowid,
+                'label' => $obj->label,
+                'number' => $obj->number,
+                'bank' => $obj->bank,
+                'account_code' => $obj->account_number, // Use the linked accounting account code
+                'account_label' => $account_label
+            );
+        }
+        
+        return false;
+    }
     
     /**
      * Submit declaration (create accounting entries and update status)