Dual Layer DVD error

Hi, I'm having a bit of a mare with prepping a dual layer dvd in DSP. I have read previous threads and followed instructions from a a manual but am still having problems.

The original footage is HD. My initial run at compressing to HD1080i PAL was an error. Too much footage and too high a bit rate. So I compressed it to FCP's '90 min -Fastest Encode' and imported it in. I realise that resolution would be compromised but needed something to show a client the early part of next week. It takes a day to compress stuff.

When I go to simulate the project the warning comes up - 'Illegal angle situation - only the main angle will be simulated'. This happen when it was 1080i and is still happening. I am using mixed-angle tracks and have used sandwich markers to mark out the multi-angle sections (there are only 2). The compression rale is 6.25mps (less than the requisite 8). Do I need to forget the sandwich markers and make both tracks the same length or is my compression choice wrong? If so, which compression rate do you recommend?

I am totally flumoxed. The clock is ticking with the client so any advice would be gratefully recieved.