Unfortunately, form rules do not work in grid edit mode and there's no way to create a formula to indicate a field was changed. I only see two options in grid edit:
- Have the field capture the history in order to see when it was changed.
- Create a formula field to look at the last modified date and have a formula checkbox to look at a date range of last modified. For example if the record was last modified in the last two days, display as checked. Problem here is that you're looking at the record and not the two fields.
I know many of us entered a User Voice asking for the ability of applying form rules to grid edit.
