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When I trying to build of lines from points, I get some thing like this:

I am using LineBuilder, and group by attribute (each group of points has a different name), but I don't understand why I also get connect line (green one) between them ?

That should work.

I can only speculate that the Group By Attribute is either not set, or set to an Attribute that has the same value per Point Group, however you've indicated these have been set correctly.

Otherwise it could be a Bug. I noticed that latest version of FME has removed the previous "Connection Break Attributes" Parameter from the Transformer, and replaced that with the "Group By" Parameter, which should work the same way as before, but there may have been a bug creep in from the Transformer update?

@pavelpostnov can you attach a smaple of the data and your workspace?

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