Revit 2020 warning "A transaction or sub-transaction was opened but not closed"

[Anonymous]

I use Advance Steel API to model member and joint in Revit. Code is working fine in Revit 2019.2. Now I recompiled in Revit 2020 using new DLL, setup similar to Revit 2019.2. Program is executed, I can debug and tract. I got warning "A transaction or sub-transaction was opened but not closed, All changes to the active document made by External command will be discarded."

Exactly same code, work in Revit 2019, but not Revit 2020. Is there something special in Revit 2020 I need change?

In same exe, Revit related commands works fine, but not those related to Advance Steel API.

As all Advance Steel expert are here. I post it here instead of Revit Forum.

Any idea or suggestion?

[Sebastian_Eiche]

Maybe this is better to ask in the Revit Forum or not?

[ChristianBlei · Accepted solution]

Hi,

there are changes to the API from AS2019 to AS2020.

A change is that you have explicitly commit a transaction now, otherwise the chnges will get descarded.

That is what the message is about.

So Do:

Documentmanager.LockCurrentDocument

Using transaction= transactionmanager. startTransaction

// do your stuff

transaction.commit

end Using

DocumentManager.UnlockCurrentDocument

There is a knowledgebase article   here  about these changes.

HTH,

Christian Blei