diff --git a/frappe/utils/data.py b/frappe/utils/data.py
index 59c5cd9c30..a5a0ab7684 100644
--- a/frappe/utils/data.py
+++ b/frappe/utils/data.py
@@ -964,3 +964,7 @@ def get_source_value(source, key):
 		return source.get(key)
 	else:
 		return getattr(source, key)
+
+def is_subset(list_a, list_b):
+	'''Returns whether list_a is a subset of list_b'''
+	return len(list(set(list_a) & set(list_b))) == len(list_a)
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