[FIX] check if the line have an amount currency instead of the linked account currency

account_financial_report_webkit_xls/report/open_invoices_xls.py

@@ -355,7 +355,7 @@ class open_invoices_xls(report_xls):
                      cumul_balance, style_line_decimal)]
 
         if _p.amount_currency(data):
-            if account.currency_id:
+            if line.get('amount_currency'):
                 c_specs += [
                     ('curramount', 1, 0, 'number', line.get('amount_currency')
                      or 0.0, None, style_line_decimal),