How to reproduce:

• Create a LDAP data source
• Create a synchro based on this LDAP datasource
• In title mapping, set a field that is not always present (like displayName in our dev LDAP)
• Launch the created synchro
• There are unknown metadata errors during the synchro => KO
• The contents are created without title => OK, because we didn't check the Validate contents at creation check box.
• Update the syncro:
  • check the Delete obsolete contents check box
  • fix the title mapping
• Launch the synchro
• The obsolete contents are not deleted => KO