Enable Excel Iterative Calculation

Hello everybody.
I'm going to try to explain my issue; it could be a little bit long:
In my Xcelsius Dashborad, the user can make a selection on a List Box component. The value selected is the prompt for a QAAWS that retrieves more detailed data.
I refresh a graphic based upon one of the columns retrieved. And here comes my trouble: the value could be blank.
In this case, I want my graphic remains unchanged.
For doing this, I'm trying to create a formula that copies the value when it changes but left it unchanged (the prior value) when it becomes blank. My first try results in a circular reference
In B1 cell --> =IF(AND(B1<>A1;A1<>"");A1;B1)
I've found that there is a way to allow Excel to deal with that. (see this link: http://office.microsoft.com/en-us/excel/HP100662431033.aspx).
But if I allow circular references in a separete Excel template and then import it into Xcelsius, it seems that goes crazy, and becomes with an unpredictable behavior, and almost always Xcelius brakes after a while.
So, what I want to achieve is that when a  A cell changes, copy its value to another B cell, and when A becomes blank, do nothing (left the previos value in B).
I hope I've made understood the problem and anybody can help.
Thanks in advance.

Same problem here. After importing an Excel model with iterative calulation enabled Xcelsius notifies of a circular reference. The app does not seem to allow the user to enable this option again (under Excel Options>Formulas>Calculation Options).
So can Xcelsius handle iterative calulation at this stage?

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    cfow wrote:
    i have a question as i am very new to numbers (excel too for that matter) I imported a model from excel that has circular references until i enable iterative calculations.( to do it in excel: Select ALT T, O and then on the 'Calculation' tab check the box that says enable iterative calculation.) how would i do this in numbers?
    For Numbers, a circular reference is an error, no way to change that.
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    regards
    sreelatha gullapalli

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              repeat while value of cell "B5" < value of cell "B4" -- B4 has the number of iterations
                        set value of cell "B2" to value of cell "B3"
                        set value of cell "b5" to (value of cell "B5") + 1
                        delay 0.5
              end repeat
    end tell
    Here is the result:

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