Installation and Upgrade > Installation and Configuration Guide - Update Existing Installation > Updating an Existing Installation > Post-Update Actions > Updating from a Release with WindchillDS to a Release without WindchillDS
  
Updating from a Release with WindchillDS to a Release without WindchillDS
Before Windchill Update, if a group is represented by UFID and will be stored in the database post-update, for all such groups specify WTPrincipalReference in the securityLabelsConfiguration.xml after Windchill Update and before running the Windchill Update tool. For more details, see Specifying a WTPrincipalReference.
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This configuration is a mandatory step before running the Windchill Update tool. If you miss this step, the method server will not start after the Update tool is run as UFID information for groups in the database will be invalid.