This item has been identified as a known issue, please contact Support at firstname.lastname@example.org if you encounter this.
A workaround is provided until the issue is officially fixed.
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)
Internal Reference: ALM-1391