I am having the same problem (trying to merge or append simple point shapefiles) and I think it's due to (text) fields that have identical names but different lengths. I did not have this problem in Arc 9.x. Is there a way to manage this in the Field Map or elsewhere? My only solution seems to be to re-create the problematic fields in a template shape and make them at least as large as the largest record. Help! (Am using ArcMap 10.0, SP 2, ArcInfo)
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