I’m not sure what you want to achieve, but I think you misunderstood the functionality of the Tester, a Tester evaluates each feature against one or more user-defined tests, see docs:

https://docs.safe.com/fme/html/FME-Form-Documentation/FME-Transformers/Transformers/tester.htm

You don’t need to loop either if I understand your case well, you’ll need some Python or custom transformers to loop anyways.

The point here, I guess, is to set the correct ‘Group By’ settings in your ‘PROCES’-bookmark. Set Group By to id and the processing is done for each group of features (id by id) separately. Maybe this is a good starting point: https://docs.safe.com/fme/html/FME-Form-Documentation/FME-Transformers/Group_Based_Transformers.htm 

I’m trying to get my head around this.

I don’t think you need the Creator path and all that, I think (based on what you do in processing) you should look into the Fanout option in your DWG writer (write different DWG’s based on attribute values) and perhaps a group by option in the processing.

Despite the very complete question, I have a hard time understanding what you try to achieve.

If I understand correctly, you have sets of lines with corresponding id’s. You want to process these lines and write the result to a cad file per set.

There are different ways to solve this:

• Group By
  • A lot of transformers have a Group By function, which you can use to subbproces features which have a common id.
• Custom transformer
  • Create a custom transformer and configure it to do the group by over the entire custom transformer.
• Workspacerunner
  • Create a child worspace where the work is done and a parent workspace which initiates the child to do the work.

When writing, you can just use a FeatureWriter and use the common id as input for the filename, which will result in a file per common id.

I attached a sample workspace demonstrating the Group By and the Custom transformer. If I misunderstood, try and explain what you want, with a printscreen or .FFS file of the input and expected output.

@nielsgerrits @becchr @redgeographics thanks guys for reply. 

I found solution for my problem, I edit my NeighbourPairFinder transformer and add Group by Process into transformer.

Unfortunately I have a new problem… I want to create vertex from line and it's work for 95% points, but transformer want to create some points. I don't get it why, I try to move vertex in dwg, change Z coordinate but every time it's the same, won't create point

Where is blue/dark dot must be the point, but isn't:

P.S. Thank you guys so much for useful advices, you save my time :D

@nielsgerrits @becchr @redgeographics thanks guys for reply. 

I found solution for my problem, I edit my NeighbourPairFinder transformer and add Group by Process into transformer.

Unfortunately I have a new problem… I want to create vertex from line and it's work for 95% points, but transformer want to create some points. I don't get it why, I try to move vertex in dwg, change Z coordinate but every time it's the same, won't create point

Where is blue/dark dot must be the point, but isn't:

 

P.S. Thank you guys so much for useful advices, you save my time :D

Always hard to say without data, when I have these issues, I isolate the subset and let only those features throught which cause issues to research.

@nielsgerrits

The task I am doing is complex, but I will try to explain it as briefly but clearly as possible.
 
1. I have polylines with id and DET_OPIS attributes - dwg
2. From polylines I need to get points (coordinates X Y Z)
3. I need to find the middle point between two opposite points - I use the NeighborPairFinder transformer
4. with the middle points I have to draw one polyline which will be the middle line

I also added a zip file with data, I hope it will be clearer now

thank you