[mapguide-users] Join features with non SDF sources

[Kenneth, GEOGRAF A/S]

I am trying to join an OGR datasource with ODBC data.

If I use MGE, I get strange results, such as "select" command selects 
wrong, click select doesn't work while rectangle select partially works.
The data gets displayed fine, and even themed with ODBC data.

I then tried to replicate this behavior on MGOS 1.2 RC2 (as I can debug 
that), I get another message from Studio:
"This type of feature source cannot be added as a join. Please try again."

This message appears when as I am trying to  join an ODBC datasource to 
an OGR source.
The same procedure against MGE does not give the error.

If I convert the OGR data to SDF, I get no messages on MGOS, and MGE has 
no problems selecting.

Is it "by design" that such joins does not work?
Are there any precautions/common problems for workin with joins?

-- 
Regards, Kenneth, GEOGRAF A/S