literature self_buy_giveData variable is now required in extern view

input/forms.py

@@ -117,7 +117,7 @@ class CheckForm(FdbForm):
 class LiteratureForm(CheckForm):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
-        self.fields['selfbuy_give_data'].required = False
+        self.fields['selfbuy_give_data'].required = True
     class Meta:
         model = Literature
         fields = ['cost', 'info', 'source', 'notes', 'selfbuy', 'selfbuy_data', 'selfbuy_give_data']