diff -r 1dcc52f5e340 -r a1e8dbb7215b server/test/unittest_rql2sql.py
--- a/server/test/unittest_rql2sql.py	Thu Jun 25 22:12:49 2015 +0200
+++ b/server/test/unittest_rql2sql.py	Thu Jun 18 18:26:02 2015 +0200
@@ -563,6 +563,17 @@
      '''SELECT _X.cw_eid
 FROM cw_Note AS _X
 WHERE _X.cw_eid IN(999998, 999999) AND NOT (EXISTS(SELECT 1 FROM cw_source_relation AS rel_cw_source0 WHERE rel_cw_source0.eid_from=_X.cw_eid))'''),
+
+    # Test for https://www.cubicweb.org/ticket/5503548
+    ('''Any X
+        WHERE X is CWSourceSchemaConfig,
+        EXISTS(X created_by U, U login L),
+        X cw_schema X_CW_SCHEMA,
+        X owned_by X_OWNED_BY?
+    ''', '''SELECT _X.cw_eid
+FROM cw_CWSourceSchemaConfig AS _X LEFT OUTER JOIN owned_by_relation AS rel_owned_by1 ON (rel_owned_by1.eid_from=_X.cw_eid)
+WHERE EXISTS(SELECT 1 FROM created_by_relation AS rel_created_by0, cw_CWUser AS _U WHERE rel_created_by0.eid_from=_X.cw_eid AND rel_created_by0.eid_to=_U.cw_eid) AND _X.cw_cw_schema IS NOT NULL
+''')
     ]
 
 ADVANCED_WITH_GROUP_CONCAT = [