How many Line Crossings can you have ?

Hello all,

First post from me, I have viewed the forum and got some good info.

I have a Hikvision 708 NI k2 8p. on the latest firmware. Im trying to find how many Line Crossings I can have set up. Im sure I had 3 set up which all worked ok, but I've had to alter the CCTV setup slightly by altering the lines. Now only 2 seems to work. Tried deleting and re applying but cant get the 3rd one to work.
Any input be very helpful.

Thanks,
FLY