Hi, Susan,
As Steve says, the Last Activity Date reflects the date that the record was last changed. There are many types of changes, other than transactions, that constitute 'activity'. Clicking OK on any screen is like saying, yes, I want to do this, effect the change. Even if you haven't done anything that is visible to you, clicking okay does update the underlying record. It also updates the Last Maintenance Date, Time and User fields.
If you don't want a record updated, press Cancel or run a report that will provide the information you're looking for.
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Regards,
Softrak Tech Support