Check to make sure that the Key field you select in Modelbuilder contains unique labels. If you're importing a Shapefile, make sure you have the option selected to establish connectivity using spatial data. If you're importing a DXF file, see this technote: communities.bentley.com/.../3070.aspx We also have a general technote on Modelbuilder here: communities.bentley.com/.../2821.aspx If this doesn't help, as Terry said, having some additional details like the type of file and the configuration of the modelbuilder steps would help.
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