Transactions in Dynamo, struggling with operation timing

[JPParker]

Seems like these nodes are hard to find good information on since everything with Transaction pulls up Revit Transaction info.

i have a script that uses a Clockwork node and simply traces area lines to room boundaries or vice versa, then using Archi-labs Delete.Elements to clean up whichever the person is switching from/to. (Long story, don’t knock the horrid technique, it’s to fix a ongoing problem they’ve been doing for months!)

I have a Transaction.Start and Stop in place, but every other time I open and run the script it will fail. I simply switch the locations of my Transaction.Start/Stop and run it again (After a Revit Undo) and it works perfect.
This tells me I’m not using transactions properly, so I’m pausing the operation every other time I execute it, but I’m struggling to figure out how and where to use the Transactions. Any help here how I can control the delete AFTER the lines have been created by the Clockworks node?

[cgartland]

I would add a passthrough node (also from Clockwork) to connect the left side of your graph to the right side. Sounds like you’re running into a classic race condition. By adding the passthrough node, it will ensure that the left side of your graph finishes executing before the right side begins.

[JPParker]

It failed too, same problem. Tried it. Here’s a better image of my transaction locations, I thought the built in screenshot tool allowed zoom.

[JPParker]

I take that back! Again, I had it in the wrong place, seems reliable now! Thanks! I wouldn’t of looked at it again without mention.