Sales order process E1 release 9.2 update original promised date

the original promised date, equal request date, the system entry with confirm sales order.

but after create sales order, for us the order is not confirmed, because first after the confirmation of the delivery date from the planner, we print order confirmation (maybe with another date)

so with print of the order confirmation we like to update the original promised date.

for us, the changed request date from the planner is exactly our promised delivery date and this date we also print on the order.

is a update of promised delivery date with print order confirmation possible or not?