Add debugging to saveAccountingEntries method

- Add debug log to track user parameter in saveAccountingEntries
- Help identify where user parameter is getting lost in the chain

core/class/declarationtva.class.php

@@ -1212,6 +1212,8 @@ class DeclarationTVA
      */
     private function saveAccountingEntries($entries, $declaration, $user)
     {
+        error_log("DEBUG: saveAccountingEntries called with user: " . ($user ? "VALID" : "NULL"));
+        
         if (empty($entries)) {
             return true; // No entries to save
         }