I have dispatcher with two operators. Operators are supposed to pick up widgets from 5 different stock piles. Once operator 1 starts picking from stockpile 1, I don't want operator 2 to pick from stockpile 1 even if widgets are available to pick up. So once an operator is assigned to stockpile it will continue until stock pile is empty. How can I model this using dispatcher? Based on the operator availability either operator could pick from any stockpile.