Why business-central.war requires a DataSource in BRMS?

Issue

• business-central.war fails to deploy because of missing ExampleDS. Why BRMS requires a DataSource?

2018-03-05 01:33:05,759 ERROR [org.jboss.as.controller.management-operation][Controller Boot Thread] JBAS014612: Operation ("deploy") failed - address: ([("deployment" => "business-central.war")]) - failure description: {"JBAS014771: Services with missing/unavailable dependencies" => ["jboss.persistenceunit.\"business-central.war#org.jbpm.domain\" is missing [jboss.naming.context.java.jboss.datasources.ExampleDS]"]}