The customer is having a sales order with 3 different dates, and when executing ‘Calculate confirmed delivery dates’ on a sales order, neither the line number in ascending order, nor the requested delivery dates, are considered when the different lines are calculated. Instead, it looks like the last order line (the highest line number) is always calculated first, which often means that order lines with the newest requested dates allocates quantities available for more urgent shipments.

It should be expected that the lines within the order are calculated in the following sequence: ascending requested ship date.