added validation-check for existing incorrect ibans

jdav_web/finance/models.py

@@ -497,7 +497,7 @@ class Transaction(models.Model):
 
     def __str__(self):
         return "T#{}".format(self.pk)
-    
+
     @staticmethod
     def escape_reference(reference):
         umlaut_map = {
@@ -510,15 +510,19 @@ class Transaction(models.Model):
         allowed_chars = r"[^a-z0-9 /?: .,'+-]"
         clean_reference = re.sub(allowed_chars, '', int_reference, flags=re.IGNORECASE)
         return clean_reference
-    
+
     def code(self):
-        
+
         if self.amount == 0:
             return ""
-        
-        reference = self.escape_reference(self.reference)
-        iban = IBAN(self.member.iban)
+
+        iban = IBAN(self.member.iban, allow_invalid=True)
+        if not iban.is_valid:
+            return ""
         bic = iban.bic
+
+        reference = self.escape_reference(self.reference)
+
         return f"""BCD
 001
 1