Add Payment order template

modules/purchase_trade/invoice.py

@@ -227,11 +227,16 @@ class Invoice(metaclass=PoolMeta):
     @property
     def report_payment_order_currency_code(self):
         currency = self.currency
-        return (
-            getattr(currency, 'code', None)
-            or getattr(currency, 'rec_name', None)
-            or getattr(currency, 'symbol', None)
-            or '')
+        code = getattr(currency, 'code', None) or ''
+        rec_name = getattr(currency, 'rec_name', None) or ''
+        symbol = getattr(currency, 'symbol', None) or ''
+        if code and any(ch.isalpha() for ch in code):
+            return code
+        if rec_name and any(ch.isalpha() for ch in rec_name):
+            return rec_name
+        if symbol and any(ch.isalpha() for ch in symbol):
+            return symbol
+        return code or rec_name or symbol or ''
 
     @property
     def report_payment_order_amount_text(self):