Need help for stack update feature for scaling out use case or add new resources

Hi Team, I have a stack template with 3 nodes , each node having a volume attached ! Now i updated my template with additional node and additional volume for that node ! This results in user_data update of a node in template ! And when i perform stack update feature , it gives me error: Invalid volume: Volume 01e40c6e-4467-42fe-ba9d-ce7012db8978 status must be available or downloading to reserve, but the current status is in-use. This shows for the node (where user_data is changed) and yes it is currently in use ! Then how one can update the stack using stack update feature of openstack with volumes ? Rahul