Conditionalizing text insets
FrameMaker 10, Windows 7 x64.
I have a document with a lot of external files inserted as text insets. I would like to have this file appear in a book only under certain conditions. I've created the appropriate conditions, selected the entire file, and applied the conditions. All of the insets are conditionalized, with the exception of a single inset. When I reselect that inset and attempt to reapply any of the conditions, I get a dialog, whose title is too long for its size, so you cannot fully comprehend the purpose. See below.

I do not wish to make the text unconditional, and I do not wish to delete the text. I wish to set a condition. There is nothing I can find in any FrameMaker resource that describes why I am getting this message, or what to do about it. All of the other insets are correctly conditionalized.
Any ideas?
Steve
