BUG
** This issue is addressed in ArcGIS 9.0 Service Pack 2 (SP2) **
Fatal error will occur when making the Field expression a model parameter and accessing it from a tool.
For example, Add Calculate Field to Model Builder. Make the field expression a variable and set as a model parameter. Save the model and close. Double-click the model and try to bring up the field calculator. The application fatals.
Article ID:000007360
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