Access IIf statement giveing me the wrong result.

What is wrong with the following IIf statement?  I am getting negative values in the AdjustedInventoryValue field when I want it to be zero.  Sample data below the formula.  Thanks.


Value_USD      UnpostedInvAmount      AdjustedInventoryValue
 100                                                                     100
 50                              -75                                             0
150                               25                                         175
-25                              10                                           0
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The first part of the IIf() returns Value_USD when UnpostedInvAmount is null.  This expression might work better for you:
IIf(Nz([InventoryReserve]![UnpostedINVAmount],0) + Nz([InventoryReserve]![Value_USD], 0) < 0, 0, (Nz([InventoryReserve]![UnpostedINVAmount],0) + Nz([InventoryReserve]![Value_USD], 0))

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tomfarrarAuthor Commented:
Maybe that could work.  What does the Nz() function do?  Thanks.
Nz is an abbreviation for Null to zero but the Nz() function lets you specify the actual substitution.

Nz(somefield, 934) returns 934 if somefield is null
Nz(somefield, 0) returns 0 if somefield is null
Nz(somefield, "xyz") returns "xyz" if somefield is null
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tomfarrarAuthor Commented:
Okay, I am trying that out.  The formula as written did not work because of a matching "()" problem.  It appears to me the "(" after 0,0, does not need to be there.  Do you agree?  Thanks.
tomfarrarAuthor Commented:
Thanks, Pat, you formula worked perfectly!  I will remember Nz().....
tomfarrarAuthor Commented:
Thanks again....
Null happens, man.
And when it does, you use Nz() to deal with it
I will remember Nz().....

I sent my niece a t-shirt with that on the front
On the back was
Nz(SomethingTrivial, "Oh, well")
Nz(SomethingCatastrophic,"Run! Run for the hills!")

Her IT guys laugh every time she wears it :)
My husband played softball on an intercompany league and each department had their own t-shirts.  Accounting was green with a dollar sign.  Personnel was yellow with happy faces.  IT was blue with a beer stein and the words "work is the curse of the drinking class" printed in hexadecimal.
tomfarrarAuthor Commented:
That's funny stuff....
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