Planning Priority in sales order is not honored by ASCP

Hi,

I am trying to use sales order level Planning Priority, we created 5 sales orders with different SSD, one of the sales orders has a planning priority defined, and it had a higher SSD( End of the month, late than the rest of the sales orders).

since the sales order with higher SSD is defined with Planning Priority, we expect the available onhand to be pegged to that order first, but the plan is sorting and pegging the available on onhand based on SSD in Ascending order and recommends a planned order for the remaining

we are using standard pegging.