After repeating and reproducing the problem, I supposedly discover the cause. It occurs when change the defalt template from <Text> to <Book>. Then, UR asks some incomprehensible question, namely, whether I want to delete some attributes. If my answer is yes, it'll be my nightmare. It's only then UR creates some funny Template(s), which can't be undeleted.
If my answer is no, I'll be okay but I just don't know the ramificaiton.
I'm puzzled why changing the template could cause such catastrophic impact, while UR is supposed to be intuitive and flexible.
Armstrong
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