Excel - Formula Error on Save only

Hi there,

I have the following formula in 168 cells (the $B9 can change depending on the cell).  It apparently works and returns the data it is supposed to correctly.

=IF(ISERROR(GETPIVOTDATA(PT!$B$3,$B9 & " 'Grand Total'")),"",GETPIVOTDATA(PT!$B$3,$B9 & " 'Grand Total'"))

The problem comes why I try to save my workbook.  I get the following error:

"A formula in cell (Name:[Refinery F-Tag Tracking System.xls]Summary!REFCELL) Could not be converted because it contains a function that is not available in the file format to which you are saving.  If you continue the save, the formula and result will be saved, but the function itself will be converted to an error value.

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I get 168 errors... all my formulas work apparently, including my pivot tables and sorting macros.  I haven't found anything that doesnt work.

My question is: What the crap?  Oh... and how do I fix this?

I only get REFCELL on the very first error, the rest of them all throw a cell number.  Absolutely everything is working however.  

I initially created this workbook in Excel 97, but within the last week I have upgraded to excel 2003, although I cant see what problems that would cause in this case, especially since everything is working.

Thanks!!

Ryan