Sorry this isn't clear to me...
So when you create a blueprint in the design canvas consisting of multiple VMs, you can attach some properties to the blueprint and some to the VM within that blueprint. For example I am setting some values on the whole blueprint, such as Service RPO. This RPO dictates which set of datastores the VM should be put to. So I have another property called datastore (not the actual name) set on the VM which has an action which takes ServiceRPO as an input to generate a list of available datastores. However the form errors saying it cant find the binding property value. I can only assume because at time of request it is on a different form (linked to the deployment) and the action linked field is on a form linked to the VM.