Route Schedule Determination

Hi,

Have a question regarding route schedule determination on Sales Order.

I have created 3 route schedules; one on Monday, one on Wednesday and one on Friday. On Tuesday a place an sales order with requested delivery date on Thursday. I except the Wednesday route schedule to be determined but the Friday is determined. Why is that? and how can I make it determine the Wednesday schedule?

I will be very glad for any answers leading to a solution.

Thank you ,

Erik