I had this problem before. I wound up exporting it to a shape file, deleting the offending fields, then exporting the shape file back into the file geodatabase. Just make sure you delete all of the "SHAPE_*" fields from the shape file or you'll have the same problem again. Thanks Michael. I thought about doing that but it seems that process might introduce more problems. The line feature class takes part in a complex geometric network and is also part of some modeling efforts. I would hate to disrupt those two items in order to simply delete one, unnecessary attribute field.
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