Hi guys,
many thanks to all of you - I decided to go with arrays and wanted to share my working (simplified) result.
// don't forget to import!
import java.util.List
// get current rollershutter state (from other rule)
// it's important to cast to INT here, because otherwise you can't {get} the value at the desired array-index
var int current_rollershutter_state = (your_global_variable as Number).intValue
// initialize an array to store your desired positions per state
var List<Number> your_rollershutterpositions = newArrayList(10,20,30,40,50,60)
// retrieve the rollershutterposition for a given state
var Number specific_rollershutter_targetposition = your_rollershutterpositions.get(current_rollershutter_state)
// send command to a specific rollershutter
sendCommand(specific_rollershutter,specific_rollershutter_targetposition)
Thanks & BR,
Chris