diff --git a/conservancy_beancount/reports/core.py b/conservancy_beancount/reports/core.py
index ec71f6c5e55fc6218fae873b2f4781c53fd05792..1d271a707bb1e7bf98a796416bc55845b5c04020 100644
--- a/conservancy_beancount/reports/core.py
+++ b/conservancy_beancount/reports/core.py
@@ -29,9 +29,14 @@ from typing import (
     Mapping,
     Optional,
     Sequence,
+    Set,
     Tuple,
     Union,
 )
+from ..beancount_types import (
+    MetaKey,
+    MetaValue,
+)
 
 class Balance(Mapping[str, data.Amount]):
     """A collection of amounts mapped by currency
@@ -134,3 +139,9 @@ class RelatedPostings(Sequence[data.Posting]):
             return balance
         except NameError:
             return Balance()
+
+    def meta_values(self,
+                    key: MetaKey,
+                    default: Optional[MetaValue]=None,
+    ) -> Set[Optional[MetaValue]]:
+        return {post.meta.get(key, default) for post in self}