Count unique records in detail section of report

I've tried various queries to resolve this issue but so far no luck.  So I want to try a new approach.

I have a report that has a grouping.  In the group is a detail section that has a field named POn.  Also in the detail section of a field named POnCount.  I don't know if the VBA code I'm looking for is in the onprint or onformat event of the detail section but every time a new POn is found, increment the POnCount by 1.  If the POn was already cycled through then don't increment by 1.

The after the group has printed set the POnCOunt over at 0.

How can this be done?
SteveL13Asked:
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PatHartmanCommented:
If the report is sorted by POnCount, then add a grouping footer and let Access do the work for you.  No code required.  You don't even have to have a visible control in the footer.  Add a control, make it very small so the footer won't take up a lot of room.  Name it CountPO.  Set its ControlSource to:
=1
Set the Grouping property to OverAll.  Add a control to the report footer to display the value.
=CountPO

If not, then you will need to create a separate query that does the counting.  You can add a subreport to the report footer to display a recap that gives you the counts you want.
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