Sorry! Here's what I did by following your instructions:
I put a text box(txtCount) in the detail section of the report and set it Control Source to 1 and Running Sum to Over Group.
in the report's event On_Format, I wrote the code:
cancel=me.txtCount>3
When I ran the report, a message box pops up saying Enter Parameter. Just to ignore it, I click OK and the report will show all the records. I only need report to show 3 most recent dates records for each grouped PIN#
Hope it may help you understand my problem.
Thanks a lot!
Jinglin