Exception Trace

    wt.util.WTException: Life Cycle:
    DJ_Public:This iteration of the DJ_Public Life Cycle is used in 2 places.
    The following uses must be removed before updating the Life Cycle:
    Document 0000000023 - cbl_calc A,
    Reference Document 0000000021 - test_doc_problem_report A
	at wt.clients.lifecycle.administrator.CLifeCycleTemplate.save(CLifeCycleTemplate.java:209)
	at wt.clients.lifecycle.administrator.LifeCycleDefinitionPanel.doSaveCLifeCycleTemplate(LifeCycleDefinitionPanel.java:913)
	at wt.clients.lifecycle.administrator.LifeCycleDefinitionPanel.saveCLifeCycleTemplate(LifeCycleDefinitionPanel.java:839)
	at wt.clients.lifecycle.administrator.LifeCycleDefinitionPanel$WorkThread.run(LifeCycleDefinitionPanel.java:496)