Problem with self referencing cells

Hello there,
I'd like to have two columns that are NULL, unless the other column has a value entered into it.
This seems to create an infinite lookup loop of self referencing.
Can anyone suggest a work around?
Please see example
http://public.iwork.com/document/?a=p175104233&d=self_reference.numbers

If for instance you have
cell B2 = IF(C2="","","Not Null")
and
cell C2 = IF(B2="","", "Not Null")
then, yes, you have a circular reference
It sounds like what you want is if you enter (by hand, overwriting the formula that is there) a value in B2 then the formula in C2 will result in a value (not null). If you, instead, enter a value in C2 then the formula in B2 will result in a value.
Try this addition to the formula:
B2=IFERROR(IF(C2="","","not null"),"")
C2=IFERROR(IF(B2="","","not null"),"")
In other words, wrap it all up in an IFERROR
Message was edited by: Badunit

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