You try to access KM document List using the Enterprise Workspaces integration and encounter this error:
#2.0 #2015 09 22 12:01:47:371#+0200#Error#com.sap.security.core.imp.User#
#BC-JAS-SEC-UME#com.sap.security.core.sda#C0000A000D15A4A20000000000001870#9359750000000004#sap.com/tc~spaces.km~documentlist#com.sap.security.core.imp.User.[cf=com.sap.security.core.imp.User][md=init][cl=null]#buelteel#18786##E6C14C76610E11E5BB1F0000008ED186#ecb63e05611011e58a890000008ed186##0#Thread[HTTP Worker [@803022194],5,Dedicated_Application_Thread]#Plain##
Error while populating "SOME_USER_NAME"
[EXCEPTION]
com.sap.security.core.persistence.datasource.PersistenceException: Calculated UME LDAP id is null
at com.sap.security.core.persistence.datasource.imp.LDAPPersistence.populatePrincipalDatabag(LDAPPersistence.java:1135)
at com.sap.security.core.persistence.imp.PrincipalDatabagFactoryInstance.getPrincipalDatabag(PrincipalDatabagFactoryInstance.java:3124)
at com.sap.security.core.imp.User.init(User.java:301)
at com.sap.security.core.imp.AbstractPrincipal.<init>(AbstractPrincipal.java:149)
This issue is caused due to the fact that user SOME_USER_NAME was deleted although it was written as last edit.
Add SOME_USER_NAME again, then you will be able to delete the folder or access it.