"Populate the fields Prefix, First, Middle, Last and Suffix in the WTUser table" returns "LDAP error" during upgrade of Windchill PDMLink

• User holds LDAP path to the EnterpriseLdap
• User is disconnected (= does not exist in the EnterpriseLdap)

• INFO  [UpgradeEventFirer] com.ptc.windchill.upgrade.logging.UpgradeFrameworkLogger - Migrator EXECUTING: Populate the fields Prefix, First, Middle, Last and Suffix in the WTUser table.:919772423-1197561275280-14600371-207-10-253-132 (0.0%) - Populate the fields Prefix, First, Middle, Last and Suffix in the WTUser table. started

• INFO  [UpgradeEventFirer] com.ptc.windchill.upgrade.logging.UpgradeFrameworkLogger - Message: PopulateUserFullNameFields START:1333609499523
  ERROR [main] wt.method.client - RemoteMethodServer.invoke() called on default method server from within method server! Bad loopback code!
  Caused by: wt.util.WTException: Error in finding mapping key for "<WTUser.name>" in adapter : <EnterpriseLdap>.jndiAdapter
  Verschachtelte Ausnahme ist: com.infoengine.exception.adapter.IEAdapterException; verschachtelte Ausnahme ist:
  javax.naming.NameNotFoundException: [LDAP: error code 32 - 0000208D: NameErr: DSID-031001CD, problem 2001 (NO_OBJECT), data 0, best match of:
  '<Search path for users in EnterpriseLdap>'
  ]; remaining name '<User path in EnterpriseLdap>'
  at wt.org.PopulateUserFullNameFields.readPrincipal(PopulateUserFullNameFields.java:335)
  at wt.org.PopulateUserFullNameFields.populateAdditionalFieldsAndUpdate(PopulateUserFullNameFields.java:158)
  at wt.org.PopulateUserFullNameFields.runMigration(PopulateUserFullNameFields.java:98)
  ... 23 more

• Caused by: wt.util.WTException: Error in finding mapping key for "user.cn" in adapter : com.ptc.vmwindchill10x.ldap-pending
  Nested exception is: com.infoengine.exception.adapter.IEAdapterException; nested exception is:
  javax.naming.NameNotFoundException: [LDAP: error code 32 - The search base entry 'uid=user_name_?,ou=pendingUsers,dc=team-ind,dc=com,cn=configuration,cn=Windchill_10.0,o=ptc' does not exist

javax.naming.NamingException: [LDAP: error code 1 - The provided value "xxxxx" could not be parsed as a valid distinguished name because it contained an RDN containing an empty attribute name]
    at com.infoengine.jndi.JNDIAdapterImpl.processRequest(JNDIAdapterImpl.java:254)
    at com.infoengine.procunit.adapter.Adapter.send(Adapter.java:391)
    at com.infoengine.SAK.ObjectWebject.invoke(ObjectWebject.java:262)
    at com.infoengine.compiledTasks.file.C$3a$5cptc$5cWindchill_10$2e1$5cWindchill$5ctasks.wt.federation.queryprincipals$2exml.invoke(queryprincipals$2exml.java:100)
    at com.infoengine.SAK.Task.invoke(Task.java:1806)
    at com.infoengine.SAK.Task.invoke(Task.java:1714)
    at wt.org.PopulateUserFullNameFields.readPrincipal(PopulateUserFullNameFields.java:310)