# How to set manually the percentage for a rollershutter

• Platform information:
• Hardware: Rasp PI 4B
• OS: openHABian
• openHAB version: 2.5 stable

Dear all, my LCN (LCN-UMR) modules don’t provide an indicator of the rollershutter, but other means I utilize to calculate the percentage (which I already use for my rules for automatic sun protection). Now I want to set manually the percentage level to ensure I see the correct value in the Basic UI.
I tried

``````Rollladen_west.state = 0
``````

but I get the following error message when the rule is executed

``````[ERROR] [ntime.internal.engine.RuleEngineImpl] - Rule 'Rollladen_west fährt': An error occurred during the script execution: Could not invoke method: org.eclipse.smarthome.core.library.items.RollershutterItem.setState(org.eclipse.smarthome.core.types.State) on instance: Rollladen_west (Type=RollershutterItem, State=0, Label=Rollladen west, Category=rollershutter, Groups=[g_OG_Rollos])
``````

What can I do?

``````Rollladen_west.postUpdate(0) //Will change the value in OH but NOT send the value to the device