Syntax changes between DB2 for i (DB2/400) v5r4 and v6r1 Does anyone know where can I find list of syntax changes between DB2 for i v5r4 and v6r1?

We are currently migrating a backing database for an application from DB2 for i v5r4 to v6r1 and found out that some queries no longer work on the new version. However we cannot seem to find any official reference regarding this in ibm sites (or anywhere else for that matter).
Here is documentation for DB2 for i on i5/OS V6 R1.

Here is specific to DB2 itself.

Here is specific to DB2 SQL.