Create layer break position at a .IFO/,BUP file

[dbminter]

What exactly happens when you choose to create a layer break position at an .IFO/.BUP file when offered other than at a VOB?  Does the break go before the video that the .IFO points to/the .IFO that the .BUP is a copy of points to?  Or is there actually a layer transition that starts at that .IFO/.BUP file on the disc?

[LIGHTNING UK!]

If it's not within a VOB file, but on a file, it just means that file will be the first thing on the 2nd layer. The VOB files sit between the IFO and BUP files, so it means there will be no transition point within them.