Hi Kai Piontek,

Thank you for reporting this issue.  We will need to investigate support provided for this FileType from the Project Automation API and identify if we need to make further adjustments.  For now I have added an item on our board, internal reference: SDLCOM-3153; we'll followup once we pick this up.

I might followup with you directly if we need more information.

Thank you,

Patrick.

Hi Kai Piontek,

I've not been able to reproduce this error.  It would help if you could share the source code related to the automation procedures with me at phartnett@sdl.com

Can you explain a bit more, what you mean, when you say: "running parallel batch tasks with the project automation API."? 
Please keep in mind that Trados Studio desktop application is not designed to simulate server behavior.  I fear that the case you are describing here is related to that, in which case, it's simply not supported.  However, instead of jumping to that conclusion, It would be useful if you could share your code with me and I will follow up with a more conclusive response.