Could someone tell me why I have the error message below and what should I do to solve the problem ?
org.jboss.deployment.DeploymentException: Atleast one role of a foreign-key mapped relationship must have key fields: ejb-relation-name=Location-City
at org.jboss.ejb.plugins.cmp.jdbc.metadata.JDBCRelationMetaData.(JDBCRelationMetaData.java:321)
at org.jboss.ejb.plugins.cmp.jdbc.metadata.JDBCApplicationMetaData.(JDBCApplicationMetaData.java:325)
at org.jboss.ejb.plugins.cmp.jdbc.metadata.JDBCXmlFileLoader.load(JDBCXmlFileLoader.java:67)
at org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager.loadJDBCEntityMetaData(JDBCStoreManager.java:677)
at org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager.initStoreManager(JDBCStoreManager.java:389)
at org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager.start(JDBCStoreManager.java:339) .............
