Warning: Target Connection Group's connection doesn't support transactions. Targets <target names> may not be loaded according to specified transaction boundary rules!
You are running a source-based commit or user-defined commit session, and the named targets may not recognize transaction boundaries. This might happen with flat file targets or with bulk loading.
This is an informational message for flat file targets, as flat files are commit-neutral. If you run the session in bulk mode, and you want to ensure that the targets load according to transaction boundaries, you can edit the session and run the session in normal mode.