Hi all! I have several families with the same shared parameter, which I’ve to add a formula and recharge into the project. The idea is simple…open the families, modify the parameter, save and load back…but a strange error appears: "Warning: Formula.Set operation failed. A sub-transaction can only …

Hello, What is the parameter typ? What is the result when you do it manualy. to a “text” parameter you can`t add a forumlar KR Andreas

My guess is the node may not be written properly or to receive the data structure you’re giving it. That error usually occurs if you try to modify a document but reference another one in the actual transaction making that change.

Hi, thanks for your response. The parameter type is number type [image] if I do everthing manually there is no problem

So…there’s no way to modify a family “externally” (without open .rfa document manually) and load it back to the current document :frowning: ?

I’ve done this for families from a directory before without issue, can’t see why edit/modify/load wouldnt work similarly if Revit sees them as family documents. Orchid package has nodes for all those steps, I’m not sure which package the node you’re using is from. This is my workflow for reference …

Thanks @GavinNicholls , I was missing that silly error. Another point was, the node Formula.Set must be launched when Revit opens the families, and it takes a bit long so I had to add a datastream.await extra node to assure setting the formula only when families are opened and not before [image] I…

… triple post? Troubleshoot on the other thread vs revive a 3 year old one please :slight_smile: [image] Is it possible to set the parameter formulae for multiple families in single click and save? Revit Double post?

Closing this one for future replies.

Problem creating a formula into a parameter

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GavinNicholls October 2, 2024, 8:24am 10

… triple post?

Troubleshoot on the other thread vs revive a 3 year old one please

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Problem creating a formula into a parameter

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