diff --git a/fet2020/finance/admin.py b/fet2020/finance/admin.py
index 82ad92f6..2df79275 100644
--- a/fet2020/finance/admin.py
+++ b/fet2020/finance/admin.py
@@ -22,7 +22,7 @@ class BillInline(admin.TabularInline):
     can_delete = False
     extra = 0
     max_num = 0
-    readonly_fields = ("purpose", "amount", "file_field")
+    readonly_fields = ("purpose", "amount", "file_field", "affiliation")
     show_change_link = True