What is the last workorder number used in your AyaNova? Open Service navigation pane and sort by the Wororder column so that the highest number is listed first - tell me this workorder number.
You can not set the Service Workorder Start Number to less than that of the number of the last workorder. As I know that even the trial data had workorder numbers at least past 40, I know it is not possible for you to even had it presently set to 0 let alone 1 as the next starting number