meta_entity: Not required for Equity accounts.

conservancy_beancount/plugin/meta_entity.py

@@ -39,7 +39,7 @@ class MetaEntity(core.TransactionHook):
         if txn_entity_ok is False:
             yield errormod.InvalidMetadataError(txn, self.METADATA_KEY, txn_entity)
         for post in data.iter_postings(txn):
-            if post.account.is_under('Assets', 'Liabilities'):
+            if post.account.is_under('Assets', 'Equity', 'Liabilities'):
                 continue
             entity = post.meta.get(self.METADATA_KEY)
             if entity is None:

tests/test_meta_entity.py

@@ -84,6 +84,7 @@ def test_invalid_values_on_transactions(hook, src_value):
 @pytest.mark.parametrize('account,required', [
     ('Accrued:AccountsReceivable', True),
     ('Assets:Cash', False),
+    ('Equity:OpeningBalances', False),
     ('Expenses:General', True),
     ('Income:Donations', True),
     ('Liabilities:CreditCard', False),