DB connect with a DB2 backend

I am trying to create a manual datasource from a source system (DB CONNECT) which is DB2. However, I face the following problem:

1. Select the table all okay

2. Proposal - No fields are available from the table (all fields and table names are in upper case)

3. When I have a SQL Server backend the proposal tab provides a list of fields from the table

Can anyone assist with this

Thanks