Ghost,
A "CHG" {change message] is far FAR
FAR better than a Cancel and refile!
On a change, all we do is input the said change [A/C type, Flight Level or even route] into the Host Comp. and it "adapts" your type, for speed, and I think climb rate.
On a refile, as you say, the plan is removed from both Brussels AND our ATC compy, ergo, instant delay
file a CHG not a DLA[delay]
we aim to please, it keeps the cleaners happy