KPI : Average time of creating PO

Hi, I’m trying to calculate a KPI about the time between each creation of PO for a specific material in a dropdown buttom. All option I’ve try, i receive an error message see picture.

Uploading: image.png…

Thanks in advance.


it seems like the screenshot was not updated succesfully. Can you please try again to upload the screenshot? The used PQL formula would also be helpful.