--- a/server/sources/rql2sql.py	Thu Jun 25 22:12:49 2015 +0200
+++ b/server/sources/rql2sql.py	Thu Jun 18 18:26:02 2015 +0200
@@ -397,11 +397,14 @@
             yield 1
             return
         thisexistssols, thisexistsvars = self.existssols[exists]
+        notdone_outside_vars = set()
         # when iterating other solutions inner to an EXISTS subquery, we should
         # reset variables which have this exists node as scope at each iteration
         for var in exists.stmt.defined_vars.itervalues():
             if var.scope is exists:
                 thisexistsvars.add(var.name)
+            elif var.name not in self.done:
+                notdone_outside_vars.add(var)
         origsol = self.solution
         origtables = self.tables
         done = self.done
@@ -417,6 +420,10 @@
                 for var in thisexistsvars:
                     if var in done:
                         done.remove(var)
+                for var in list(notdone_outside_vars):
+                    if var.name in done and var._q_sqltable in self.tables:
+                        origtables[var._q_sqltable] = self.tables[var._q_sqltable]
+                        notdone_outside_vars.remove(var)
                 for rel in exists.iget_nodes(Relation):
                     if rel in done:
                         done.remove(rel)

--- 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 = [