diff --git a/acs/abac/core.py b/acs/abac/core.py
index 4733203..94c68f1 100644
--- a/acs/abac/core.py
+++ b/acs/abac/core.py
@@ -950,6 +950,15 @@ def load_profile_by_dic(profile, dic):
                     % (str(source), str(dic[source])))
 
 
+def get_assertions_from_definition(profile, definition, source=None):
+    if not source:
+        return [a for a in profile.assertions.all() \
+                    if a.definition.id == definition.id]
+    return [a for a in profile.assertions.all() \
+                if a.definition.id == definition.id \
+                and a.source.id == source.id]
+
+
 @transaction.commit_manually
 def remove_predicate(predicate):
     try: