ExtensibleXmlParser error : "The value '#{processName}' of attribute 'calledElement' on element 'bpmn2:callActivity' is not valid with respect to its type, 'QName'." in BPM Suite

Issue

• If I specify a process variable #{processName} for subprocess Id in Resusable Subprocess, I get the following errors on kjar deployment.

12:01:50,987 ERROR [org.drools.core.xml.ExtensibleXmlParser] (http-/0.0.0.0:8086-5) (null: 37, 165): cvc-datatype-valid.1.2.1: '#{processName}' is not a valid value for 'QName'.
12:01:50,989 ERROR [org.drools.core.xml.ExtensibleXmlParser] (http-/0.0.0.0:8086-5) (null: 37, 165): cvc-attribute.3: The value '#{processName}' of attribute 'calledElement' on element 'bpmn2:callActivity' is not valid with respect to its type, 'QName'.