080045 : Cannot change existing fields on geodatabase files.
Descripción
Used in: Assign by Trade Area andAssign by Closest Stores Location. Used in case 'Store ID link field' exists in output feature class and can't be deleted. Used only if feature class is personal geodatabase
Solución
Please restart ArcMap and either choose shapefile customer data or specify new field on personal geodatabase file.
7/11/2012