Index: openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/DB2Dictionary.java
===================================================================
--- openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/DB2Dictionary.java	(revision 529721)
+++ openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/DB2Dictionary.java	(working copy)
@@ -234,7 +234,7 @@
      * updateClause and isolationLevel hints
      */
     protected String getForUpdateClause(JDBCFetchConfiguration fetch,
-        boolean forUpdate) {
+        boolean forUpdate, boolean subselect) {
         int isolationLevel;
         StringBuffer forUpdateString = new StringBuffer();
         try {
@@ -245,11 +245,11 @@
             else
                 isolationLevel = conf.getTransactionIsolationConstant();
 
-            if (!forUpdate) {
+            if (!forUpdate && !subselect) {
                 // This sql is not for update so add FOR Read Only clause
                 forUpdateString.append(" ").append(forReadOnlyClause)
                     .append(" ");
-            } else {
+            } else if(forUpdate) {
 
                 switch(db2ServerType) {
                 case db2ISeriesV5R3AndEarlier:
@@ -362,8 +362,23 @@
 
     public SQLBuffer toSelect(Select sel, boolean forUpdate,
         JDBCFetchConfiguration fetch) {
-        SQLBuffer buf = super.toSelect(sel, forUpdate, fetch);
-
+        sel.addJoinClassConditions();
+        boolean update = forUpdate && sel.getFromSelect() == null;
+        boolean subSelect = sel.getParent() != null;
+        SQLBuffer select = getSelects(sel, false, update);
+        SQLBuffer ordering = null;
+        if (!sel.isAggregate() || sel.getGrouping() != null)
+            ordering = sel.getOrdering();
+        SQLBuffer from;
+        if (sel.getFromSelect() != null)
+            from = getFromSelect(sel, forUpdate);
+        else
+            from = getFrom(sel, update);
+        SQLBuffer where = getWhere(sel, update);
+        SQLBuffer buf = toOperation(getSelectOperation(fetch), select, from,
+                        where,sel.getGrouping(),sel.getHaving(), ordering, 
+                        sel.isDistinct(),sel.getStartIndex(),sel.getEndIndex(),
+                        getForUpdateClause(fetch, forUpdate,subSelect));
         if (sel.getExpectedResultCount() > 0) {
             buf.append(" ").append(optimizeClause).append(" ")
                 .append(String.valueOf(sel.getExpectedResultCount()))
@@ -414,4 +429,6 @@
             return sqle.getMessage();
         }
     }
+
+   
    }