There are no "propagation issues". Any client will usually instantly pick up schema changes.
You should tell us how your client application connects to DB2, how it executes its SQL statements, what those SQL statements are, how you changed the schema at the server, how you verified that the change was successful, whether you have collected a CLI/JDBC trace and what you found there. Furthermore, it would be good if you read the post "Must Read before posting" (
Must Read before posting) and provide us with the answers to the questions raised there.