The easiest solution would be to add DatabaseId to the DBSCHEMA_CATALOGS rowset.

I put in a Connect item for it a while ago but it doesn't seem to be a...

The only way I've been able to retrieve SSAS metadata to the extent that I can get separate ID and Name properties for SSAS databases is to use the AMO....

This passes the DatabaseName where the DatabaseId should go. This can cause problems for databases that do not have the same value for DatabaseName and DatabaseId.