Attribute Connection Editor

Discussion created by glhn on May 31, 2013
I import .shp files with some attributes. I know that if I want to use my shapefile's attributes in the model, I have to define an attr which has the same name with the object attribute in the rule file. Here is the problem, I tried to select the "Object Attribute" from the Attribute Connection Editor, but it is not selectable. Here is the screenshot. Any help?