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Oh yea, my bad.  You're right.  I gave you the wrong JavaScript.  You do need to pass in an instance index for removeInstance().  It'll look something like:

// Count the number of chapters (the repeatable subform)

var nChapters = ChapterContainer.Chapter.instanceManager.count()

// Remove the last instance in the list.  Because indexes start at 0 it will be one less than the count.

ChapterContainer.Chapter.instanceManager.removeInstance(nChapters-1);

You may want to double check that.  I typed it out in the forum and not in Designer, so it may not be 100% right.  I think it is though.  This should do it for you.

Ryan D. Lunka

Cardinal Solutions Group

rlunka@cardinalsolutions.com