This could probably be logged as a usability issue but is annoying enough that I call it a bug.
Let's say you extract a template from a pipeline that has two materials and references each in the template. If you extend this template you are prompted to enter only 1 material and any parameters that may be needed. Clicking "Finish" you get the error mentioning the fact that you reference but have not defined the second material. If you were unlucky enough to enter data in any parameters they will go blank and you'll have to re-enter them again (separate issue already logged somewhere else).
The only work-around I see is to create the template extension in the xml. This, to me, it is not a very good option to force users to edit the xml because of a usability issue. In addition, depending on the rights of the user they may not even be able to do this though I have not tested it.
Thanks in advance.
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