Implementing a set-before-get-behaviour with presets

[Oliver Kraitschy]

Hello,

when implementing the set-before-get-behaviour, i have the problem that i
can't set a parameter (with a preset) which is unknown to the ACS (this
happens before any refreshObject has taken place, thus set-before-get).
The problem could be that a presets discrepancy can't be identified without
knowing the previous value.
Additionally it seems i can't refresh only the sub-nodes where i want to
set my parameters.

How can i implement this set-before-get-behaviour?

Any hints are greatly appreciated.

Greetings,
Oliver