This item has been identified as a known issue, please contact Support at support@anaplan.com if you encounter this. A workaround is provided until the issue is officially fixed. Issue Workaround Sync fails with error: "An internal error occurred while preparing the structural changes for synchronization. Please contact Anaplan Support." The issue occurs if these changes are made in the same sync: (simple list with hierarchy, i.e. child and parent items belong to same list, exists with a property already in the model) list is made to be a numbered list, item is added to list Make the list a non-numbered list, Create a revision and sync, Make list numbered, Create a revision and sync. Internal Reference: ALM-1391
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