To fetch data of all nested families I use the FamilyInstances.RetrieveNestedComponents node from Rhythm package. For single run i am encountering an empty list but on the second run, i am getting the desired ouput. Why is this happening, and is there a way to obtain the output without multiple times? Is there any alternative suggestions are welcome without using “SelectModelElements”
At a guess, you need to end the transaction after the passthrough?
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Please explain me more about this End transaction.
There is a node called transaction end, you can place it where indicated. For a more in depth abiut why, search thr forums 
Thankyou for the quick response. It really worked well 