index out of range...when I remove a field from a dataset

RS 2008

I have a report that works just fine.  For business reasons I'm able to remove a field in the stored proc that the report is based on.  After I remove the field in the stored proc, I go into my report, select the dataset and "update fields" so the field is removed.  When I try to preview the report I get the error:

An error occurred during local report processing

Index was out of range.  Must be non-negative and less than the size of the collection.

Parameter name:index

I see posts about this all over the Internet, but none relating to my specific problem of removing a field.  Let me be very clear that prior to removing the field, the report works just fine.  What I've done as a workaround is to add the field back into the stored proc, as a null.  This isn't optimal and I can't believe I'd have to do such a band-aid.  Does anyone have any suggestions for fixing this properly?

Thanks, Andre