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Hi Jorge
I attempted to replicate the scenario you've described on my own D3S Analyze 3.2.6 installation, but so far haven't been able to trigger the warning.
Tried both with JDBC Query nodes, and other nodes, at the top-level and inside a composite, and with 1 or 2 composite inputs. So there's something different and not-obvious about your data-flow that's triggering this error, or possibly the issue has already been fixed in 3.2.6.
Can you please send me an export LNA of you data-flow so I can take a closer look (please send this directly to me via email).
Also, when you get a chance please upgrade to the latest 3.2.7 release and let me know if you can trigger the warning in that version.
Thanks,
Mario