When a user clicks 'Make this title a variant" there is no indication if the title is already a variant. I became aware of this during the Serial Cleanup project, when a number of existing variants had to be redirected. I would suggest that if the title is already a VT, then the parent record number be prefilled with the current parent record number. Alternatively, a line such as "Currently a variant of <Title>", with title a click-able link, could be added to the screen when the title is already a VT.
-DES
Anonymous
Coded in edit/mkvariant.py 1.6
Implemented in r2009-30.