CopyToDVD: BUP/IFO error


I am trying to burn a DVD-Video with CopyToDVD and a NEC ND-1100A and get the following warning:

BUP/IFO of Video Title Set #20555 contains error. The resulting DVD may not work.

The DVD plays fine in the PC (using IfoEdit player (very picky) and PowerDVD - I have no stand-alone to verify). I have loaded the VIDEO_TS.IFO in IfoEdit and corrected VTS sectors etc… and can see no reason for an error.

What does the #20555 mean, as there is obviously no VTS set with that number (max is 99).

I searched and only found another thread posing the same problem with no solution.

Any ideas,
Kind Regards,