It won't save the actual date calculated. Technically the "date" is not a selection parameter. Only the minimum number of days is. If you where to change the selection criteria in the sales order, you would be changing the number of days.. I.e. you have a value of 90 days minimum shelf life required in the batch determination procedure. Lets say you reduce that to 60 days in the sales order cause the customer agrees. New batches are selected based on the new, calculated date. The calculated date is not saved. The new selection parameter of 60 days should be.
Craig