Copy Object value from one property to another on the same metadata card and allow it to be manually edited

Event-based condition cannot be used here, according to Configuring the M-Files Metadata Card they are only used for fetching suggestions from intelligence services such as M-Files Information Extractor even though the event type name would suggest otherwise: 

Try removing the event from the filter and see if you get results then, i.e. only use the object type, class and property filters.

Event-based condition cannot be used here, according to Configuring the M-Files Metadata Card they are only used for fetching suggestions from intelligence services such as M-Files Information Extractor even though the event type name would suggest otherwise: 

Try removing the event from the filter and see if you get results then, i.e. only use the object type, class and property filters.

If Joonas' suggestion doesn't work you could create a validation script. The script should check if the property value is empty (user has not entered a location manually), and if so the script should enter the location value from the asset. This will allow the user to select or change a location. The script will only set a value if the user doesn't.

This did work when creating a new object, thanks for that. I note that when changing the Asset Location later it doesn't work a second time (even if Force Set Value is on). Is that expected behavior?

Thanks that is another good method

I believe so, the MDCC guide has the following remark regarding Set Value on page 17.