HI,
I have an issue with CAESAR:
I enter the pipe element length in mm for example and it automatically converts to meters. For example 7750 mm turns to 7 m 750.000 mm!!
And this gets very annoying when I need to edit the dimension.
My unit file is in mm.
Please help.

Someone must have modified your units file mm.fil. We ship that file (stored in the SYSTEM folder) so that there are no compound units are used, compound units = length units = mm. See first illustration below.
You could either change your mm.fil content to match what is shown below (in the SYSTEM folder) or create a new set of units in your local folder (to adjust only the current folder). (If you rename your new units, be sure to update your reference in the configuration file.)
With this change, any NEW model will work as you expect. If you wish to "correct" your existing models, you must convert them. See the second illustration below. Click #1 to review and create/update your units file and click #2 to update existing files.

Hi Dave,
Thanks very much for your help. I edited the compound multiplier and converted my model unit file to the new one.
It is working as I expect now.

Best
Arman