I am sure many have come across this in AX , how is it possible to invoice the full quantity of a sales / purchase order now independent of delivery / receipt which would follow on later
Short answer is, it's not possible. The only option is pro-forma documents but I'm sure this is not what you require. This is one of those hard and fast rules in AX - you can only invoice update what is already received/delivered.
I have heard of people developing around this - try a search on linkedin, there is a similar thread there in one of the AX groups - but personally I would not mess around with this as it has implications for inventory, valuation, costing as well as just the logistical complexities.