Hello Heloisa,
It was a file parameter, in the request, of 800 Ko. To solve the case, we deleted the parameter from the recorded conversation (xml file created from "Export to:") and we have done the virtualisation using the lightened conversation.
For the next times, I asked to my colleagues to use a small file.
But if you have some good practices to follow, or if an improvement should be proposed, tell me.
Best regards