Change chapter info

I used IfoEdit 0.96 to split a DVD9 to 2 DVD-R’s. When I look at ‘VTS Overview’ of VST_01_0.IFO from Disc2, I see the first chapter is 01 instead 21:

PGC_1 (program chain): [Title(TTN): 1] [01:46:51.21 / 25 fps]…
[Ch 01] [Pg 01] [Cell 01] [V/C Id: 25/ 1]
[Ch 22] [Pg 02] [Cell 02] [V/C Id: 26/ 1]
[Ch 23] [Pg 03] [Cell 03] [V/C Id: 27/ 1]
[Ch 24] [Pg 04] [Cell 04] [V/C Id: 28/ 1]

Is it possible to change 01 into 21 in IfoEdit or another program?

i’m pretty sure that the first chapter in a PGC always has to be chapter 01 in order for it to work properly.