I'd like to change the unit in which the data of my tag shows in a trend, e.g. from MNm3/day to kNm3/day. How can I achieve this?
When you mean trends, I am assuming processBook (and not Coresight trends) and also I am assuming that you are seeing UOM because, you are pulling the values from AF into ProcessBook. In that case, follow this KB: https://techsupport.osisoft.com/Troubleshooting/KB/KB00385 that tells you how to change the UOM.
Example: Screenshot from my ProcessBook trend where I wanted the ping values to be displayed in seconds.
Retrieving data ...