Need help with Yes/No field on a report

I have a report with a field named txtOnTime which gets filled with a Y or an N which comes from a query field that reads:

OnTime: IIf([MaxOfDateShpd]<=fnMax([Ack_Date],[ReschDate]),"Y","N")

This has been working fine until I add this to the end of it:

Or IIf([ReschDate]="","Y","N")

So I end up with:

OnTime: IIf([MaxOfDateShpd]<=fnMax([Ack_Date],[ReschDate]),"Y","N") Or IIf([ReschDate]="","Y","N")

Then all records end up with a -1 in them.

Here is the code in the fnMax module someone had helped me with some time ago.
Maybe it just has to be altered but I don't know how to do it.

Public Function fnMax(ParamArray ValList() As Variant) As Variant

   Dim intLoop As Integer
   Dim myVal As Variant
   
   For intLoop = LBound(ValList) To UBound(ValList)
      If Not IsNull(ValList(intLoop)) Then
         If IsEmpty(myVal) Then
            myVal = ValList(intLoop)
         ElseIf ValList(intLoop) > myVal Then
            myVal = ValList(intLoop)
         End If
      End If
   Next
   fnMax = myVal
   
End Function

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SteveL13Asked:
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IrogSintaCommented:
In that case your formula should be:
OnTime: IIf([ReschDate] Is Not Null Or [MaxOfDateShpd]>[Ack_Date], "N", "Y")

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IrogSintaCommented:
Revise your formula to this:
OnTime: IIf(([MaxOfDateShpd]<=fnMax([Ack_Date],[ReschDate])) OR ([ReschDate] Is Null),"Y","N")

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Ron
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SteveL13Author Commented:
Didn't work.  Now I'm getting all "Y"'s
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IrogSintaCommented:
Are all the data types of your fields here set to TEXT or DATE?
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SteveL13Author Commented:
In this:

OnTime: IIf(([MaxOfDateShpd]<=fnMax([Ack_Date],[ReschDate])) OR ([ReschDate] Is Null),"Y","N")

All are date.
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IrogSintaCommented:
So if there is no date given in ReschDate, you want it to be marked as OnTime, right? If that is the case, I don't see anything wrong with the formula I posted.  Could you provide some data for each of these fields where the results come up as "Y"?
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SteveL13Author Commented:
The data is very confidential but here is a screen shot (attached).

Using this example,

Anywhere Last Date Shipped > Ack Date it should be an "N" in the On Time column.

Anywhere Last Date Shipped <= Ack Date it should be an "Y" in the On Time column.

Anywhere the is a date in the ReschDate it should be an "N" in the On Time column

Does this help?
sample.jpg
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SteveL13Author Commented:
Thank you very much.

And mbizup... thank you for the information.  

All is very much appreciated.
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