add forgotten import

bo4e · Oct 6, 2023 · 86d5472 · 86d5472
1 parent 8a88528
commit 86d5472
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/bo4e/com/externereferenz.py b/src/bo4e/com/externereferenz.py
@@ -2,6 +2,7 @@
 Contains ExterenzeReferenz class
 and corresponding marshmallow schema for de-/serialization
 """
+from typing import Optional
 
 from bo4e.com.com import COM