Hi Michael,
Webi can naturally combine different data sources via the creation of the needed data providers and the dimension merge functionality. Proceed as follows:
1. Create your BEx query and the corresponding BICS OLAP connection
2. Create a relational universe over the DB2 database and the corresponding relational connection
On your webi document:
3. Add a data provider from BEx source
4. Add another data provider from the DB2 universe
5. Combine both providers merging the appropiate dimensions on the resulting microcubes (best practice: use primary/foreign keys instead of text fields).
6. Finally create your report using the merged dimensions
There are of course other alternatives but I think this would one of the easiest to implement.
Regards,
Fernando
( Kindly assign points in case you find this reply is "helpful" or the "correct" answer to your question -- thanx ! )