Form/Subform Rollback?

[GJT]

In my application I use extensively Form/Subform relationships and have realised
a common problem throughout.......if the user makes changes to the form and then tabs onto
the subform changes are made immediately to the main form record. Further changes to the
subform are made when the user tabs to the new record or moves back onto the main
(parent) form once again. However, if the user no longer wishes to Commit the changes
to the database, how can you roll the data back for both parent and child forms?

I have read the help files about Commit Trans/Rollback - but the information gives no indication
how to implement such a solution for a parent / sub form relationship. Has anyone already
done this type of thing before? I'm sure many have.......where are you???????

Thanks for any help you can give.